Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc9416478d0d8d8…

MALICIOUS

PDF

101.6 KB Created: 2021-06-29 23:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 254e34dd21d0401d10eb6a677e496f6e SHA-1: 247e84e6bd043451e11c11a777b0bb0648813f2f SHA-256: 5dc9416478d0d8d8006161860a6fa2b8745e1858fb513e6941f125c625119bed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and does not provide direct clues, but the link farm structure is a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://fxmeat.com/upload/file/13e224d4b242ae0303c5547445478f27.pdf In PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/5eoh19rvkg357tm6avjivmijv1/31295596933.pdfIn PDF document text
    • http://tano-cable.com/d/files/42892338806.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609db6689830d---70486288473.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/b807f63cdcddc54903052332fda6bc4c/gupareduxili.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/kimojoxa.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/57368967189.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/utp7u4lkk8tt8deavdv97lki61/duzizenuvifow.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/70513505185.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/fiburanebikajin.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/bv31k8mbhndh9rmpl13unkcf2i/4069678697.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a7f2d01c2---73568330005.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/6262665047.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/77a958d50209c0510e43d2214eeb217e/76874921679.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/6036916059.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088430e91ab3---72889943521.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076427d10496---fudipafapifugovozituzabeg.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/1nbsb4rt3krauld33jaqa9cbc1/sigejotad.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///kosubajebegosodalal.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/47287283702.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/73131454685.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/gabemasugudibikugo.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/9c3547c7afeb4e20794f4ed64ff89e96/22118401109.pdfIn PDF document text
    • https://blog.aqiservice.com/quality-control-inspection-checklist/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=qc+inspection+formPDF 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_off000122c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C6 10492 bytes
SHA-256: e6a864eca81812387482d64213c98e5a48891518e316b70ca357bff370cd3c99
font_01_sfnt_off00013aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAF 17084 bytes
SHA-256: b6ee01ec868a42f2c99f4b104a6392469ce6a0f686657cd4e618ce0db18d8976
font_02_sfnt_off00016741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16741 1736 bytes
SHA-256: a970dc50f3fc642965faeb3d6f2817be39c8fee70eb220fb851f6e1b0fd382ad
font_03_sfnt_off00016f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1