Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab382507c0ed3ed…

MALICIOUS

PDF

89.0 KB Created: 2021-08-09 05:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8339ee625c257dd9e8951701c87330ff SHA-1: 3312ca2746f157d1f7ef93ed956274b46a6def48 SHA-256: cab382507c0ed3edadfb1edefde424eb247ab55db50b19f9a7fd29e9f90d8a92
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains. This pattern is commonly used to distribute phishing content or redirect users to exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://sca-kc.org/scauserfiles/files/remej.pdf In PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/c524ff24117520cb6ecc926e7cfea503/turifisunojowurixikit.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/nejexuratuxasexuze.pdfIn PDF document text
    • https://blogsma.com/files/pugolezevebolibat.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/59b859c36d88572913cb68b93c8bd2cf/misud.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/e5m0jnhrl06narjjfnmqug7cj7/wewedivowaribesax.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/36548992393.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/17584607710.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/tarakewusakokepewew.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/duzabumekixoxiwuni.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/73801741260.pdfIn PDF document text
    • https://argumentua.com/i/file/94921285796.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/gerivexifuna.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bb4bf093d---48787946516.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/c69844e448cc2f4fe4dedaef584d4cf9/rokozidekuna.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/qnuh67ma203ll6eu8pm3skefe2/924456710.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/zomifijesetaliguzozu.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/golagupodupamokoputop.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///86293243290.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/149mb7aamdrl6h5bf2kbdf5ks3/82658876305.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/dowuzuwulutemaritedif.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/45130060808.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/362eb87c052057aee183d0350515720e/8906951243.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/e4l18cajsph9md5hfk21ft77d4/99614663081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=frases+en+sentido+figurado+y+literal+del+poema+sonatinaPDF 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_off0000f390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA2 17976 bytes
SHA-256: 11f0ca5c3393b72a33d3690288390001302a4019f7a67424892ce9b4b16bbf2d
font_02_sfnt_off00013959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13959 11032 bytes
SHA-256: 0b31fbdb81ca59beaba37b501618e53963c6630b92386fa0b6a35bad7027b707