Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2affbb8cb9749b…

MALICIOUS

PDF

78.6 KB Created: 2021-09-21 18:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 05a0086925231167a960d39639254ee8 SHA-1: 6738824fbc1cb5b26f8d30f452078e75a848a84f SHA-256: da2affbb8cb9749b4cf8e62149a4032b15dbfef997bcd28a8960e0058a3b192a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable domains, suggesting a link farm designed to distribute malicious content. The presence of a 'download movie converter' URL and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a lure for users to download files. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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
  • 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 http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/fawokem.pdf In PDF document text
    • http://bjsddesign.com/filespath/files/20210909191641.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/zusajedasawuzusiwiwon.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/91753733342.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16141e5ddce8f1---41956442273.pdfIn PDF document text
    • http://ailizia.com/userfiles/30266751364.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/90281955803.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/raleraninazorowibagugijex.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134b7866cb04---45286928579.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/27188088492.pdfIn PDF document text
    • https://ordermorestuff.com/cmsCart/upload/file/67312951608.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/vurerig.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/kivevirodafadiwolafi.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/nulexobidazasotabo.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/tobezazekabinekelorise.pdfIn PDF document text
    • https://gilbertems.com/videos/file/gaputawujirotezaxomugivi.pdfIn PDF document text
    • https://tanvietnamdinh.com/uploads/files/68539887200.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/68598595612.pdfIn PDF document text
    • http://gr-chem.com/upload/files/nefuwejabiruj.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613cff6055ab2---53663144971.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/52085301633.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/13264392402.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/1579396571.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/nejuzinugipojogetiniga.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/4561fd6399006c77b527104c3e7f1d9b/73726175641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=download+movie+converterPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0A 17884 bytes
SHA-256: 08f3aff10d2c24951b571caf8fa1bb3ab8f1283cdcb48a1127ec07da58cf7acc
font_01_sfnt_off0000fcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAD 10516 bytes
SHA-256: b6563fa9e3b56be1ff6edcacfc5b5a5751dbcd9f308a6019f4a0d5187346e98d
font_02_sfnt_off00011499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1