Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a7c73d0fc4be0f…

MALICIOUS

PDF

98.6 KB Created: 2021-07-28 10:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 71d56a50a992aa581ac5d95c784402aa SHA-1: fc0c1e1c590a350b677535f601f215d82d334c06 SHA-256: 11a7c73d0fc4be0fe083cca59ef5cb5151008f36e9952869bf8dc9e5ee7d586b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160868de505a13---80914751488.pdf In PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/87916978855.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608825b012faa---ximorevujizanejipij.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/nezarulakedik.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc4b3775ee---niwopisupofovezimivela.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1ef107e8f07f498e83dc7d3fbd6fddcd/tijapikiwefu.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c03d1c8546---penigebosegusoxemivune.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/sa07ha1gaq42mviakqan2i47ch/kulamisabisotiziduboziru.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/67392593493.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/zuparo.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44fb21ad98---48013695744.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/voninunubunuroka.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d7ea01008---69929422991.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/o6e8mnpdb0a6sksip1dfo5rgjb/24585496588.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160858782ef54e---jilew.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608e32d6f28b1---geletoxerote.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad02d1f1500---65758697269.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/5865728278.pdfIn PDF document text
    • https://smartdeal.pl/files/upload/files/15327673927.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/ff3521d21843350076690830d57251fc/1835081933.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/d0bc7822ddec70be34b36cff496d70e1/2310732091.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae833494a9f---68474377158.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/c32bd346107d27a05d2acb688a970c17/duviwidafiji.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8ef5baa9fb---susevefonixijot.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a7789f4b410---jopaxogu.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/giwux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=gundam+extreme+vs+full+boost+ps3+isoPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F1 11276 bytes
SHA-256: 878d157d4038654803da63478532b80deb44b50722a374657c613db0910ff333
font_02_sfnt_off00013d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D30 4152 bytes
SHA-256: 655f11685a8ef7ac9972127089cc3de50e4bfe62fbe258ec7c85c995ddd66c63
font_03_sfnt_off00014cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF7 17904 bytes
SHA-256: e4a0e2e8d6b85d148f90706c9d5914105f1d1a7a36d4d6851ddc6a6ed1ce003a