Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b956bf6bb4efe27…

MALICIOUS

PDF

90.5 KB Created: 2021-07-04 01:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ae5d4b4ac0a812d68826f7425b6745d8 SHA-1: 85192f6530c985e9f3a405b344e39218aa765c69 SHA-256: 5b956bf6bb4efe27759784cc529b23c0f1788414b3350099b9de18d7fa522e58
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm hosted on compromised WordPress sites. Several URLs point to PDF files within formcraft or super-forms plugin upload directories, suggesting a pattern of hosting malicious content on vulnerable web applications. The presence of external URIs and the nature of the link farm suggest an attempt to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8ca5ae248---2974025208.pdf In PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed51367fa2---6802012816.pdfIn PDF document text
    • https://hiroyoung.com/data/files/rusedon.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5c101b6b---16611076826.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/89662366852.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46f676be61---podebezedokote.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/c00d29e070b5928ad6e8fd8388224e02/niwiziviz.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/xitewemanarivotusa.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/3918390a6fdf4218cd522d0ebab2c7f9/24971892915.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/93226713282.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/4580305051.pdfIn PDF document text
    • http://shepardfarm.com/clients/877021/File/21466353896.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/rofazitodaruvoniripuse.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089af38b8db6---latixo.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/99677910705.pdfIn PDF document text
    • https://artenika.pl/fck/file/59706591137.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/muvuwuxazafiniw.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/dofigatezijokakarusera.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d4efedd4210---pevirunugas.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/8a613e43b40022cae64af9cde1c5ca2f/kofad.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/xapugi.pdfIn PDF document text
    • http://mfahk.com/upload/files/73513800569.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd61ccc12d2---89681491785.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/anuq5pii3sfnamkeudcnajk2m6/88563834095.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=training+contractions+pregnancyPDF 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_off0000fee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE2 10580 bytes
SHA-256: b2a4d849b811490c3ce0fb8117b84de43dbd730ca03c607befd7947526e5bc4a
font_01_sfnt_off00011736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F48 17440 bytes
SHA-256: c14deedff9111c8e7955ee403d1a56cd1c04204eac1afebba304c7aa970eef58