Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f2e9afb5e72592…

MALICIOUS

PDF

82.4 KB Created: 2021-09-24 03:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e92be331ef87b4b3fb1d9bbc4d7f5b8d SHA-1: 425a1b8d6d747350082b0c58e4748ab7b2a2c4a8 SHA-256: e7f2e9afb5e725928ffd7b8314afa312a6a57439fc008b61ec68a4725853f855
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. Numerous embedded URLs point to external sites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this pattern, indicating the document's purpose is to serve as a deceptive gateway.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=tekken+mobile+game+download PDF link annotation
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/93923928934.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/jibevilarijik.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/fakupalabo.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/jegifuxuta.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/gosunarogixatinaguzegovo.pdfIn PDF document text
    • https://artgalery.ro/files/file/jaletomozomodewipero.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/sifusopomolufu.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/takuligibojokitenib.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/80278448744.pdfIn PDF document text
    • https://ms01bet.com/contents/files/31238368902.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/8101fa6f9c98669f9e5e3a10c1a61a17/12586363616.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/jt82vt9e9ioqgsebbcd20845v5/wumagubazeruwipalodudavum.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/jobonami.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/86096634693.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/49780782929.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e3e2be2a9a70f708b7222ea1684475bd/sojexaladigurumisupazufas.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/28603023497.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/71569001469.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/rasokuna.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/99125863560.pdfIn PDF document text
    • http://benetalent.com/upload/files/27321569556.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/71453819894.pdfIn PDF document text
    • http://cutskytools.com/d/files/zevemenimalipilumuxarezo.pdfIn PDF document text
    • http://teraval.cz/res/file/47051607943.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/litizuti.pdfIn PDF document text
    • 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_off0000dd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1A 17936 bytes
SHA-256: fb07d7a2693361a66fdfb1ba34103f6bf133459b6a7bcebf5c8df625a93072c2
font_01_sfnt_off00010c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001244d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244D 10504 bytes
SHA-256: 3c488594dd1bcc656ee6d97090ccd802241266cacd5e1fbbc08c1bca9ebf5625