Malicious PDF — malware analysis report

Static analysis result for SHA-256 207038b2fb0ead4b…

MALICIOUS

PDF

72.6 KB Created: 2021-09-17 17:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c82ef0504ae4adef3e0500534c715252 SHA-1: 2f92a815b13bd56430acc23e14e48f55915af01c SHA-256: 207038b2fb0ead4b99de92fec677a4007ecbc41cc7e08384ccab64aacb6ce811
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised or disposable hosting, suggesting a link farm designed to lead users to malicious sites. The document body is unreadable, but the heuristics and URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://prosquash.by/data/84569990832.pdf In PDF document text
    • http://hermandadperdon.es/userfiles/file/tasupuxunux.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/27793742851.pdfIn PDF document text
    • https://interconformity.ro/images/file/10704906651.pdfIn PDF document text
    • http://novafish.it/userfiles/files/53909810939.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3f817b1b9---60632162027.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/lunodenadilajud.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/xeralakuvovarifaba.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139a2962176f---25099825988.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/kejixovoripit.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/28461037118.pdfIn PDF document text
    • https://ptogel1.com/contents/files/94295995086.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/66921064871.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/5108396504.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/71646793770.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/guwozagikoniregotegajazak.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/xegavuzipeliwijo.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/difajidigokip.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/wedib.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/mamuwolegaxizujaradogox.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/7d32248220ac06edc161b48603d3d172/75644204601.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/82097503392.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/gebawosirudanivuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=lay+a+fridge+on+its+backPDF 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_off0000bc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7A 15420 bytes
SHA-256: 3d4a20d83f86982f4a915709e3e1d82386fe2ff522986dbc3de733f3e148d567
font_01_sfnt_off0000e39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 10908 bytes
SHA-256: b7fa96df9adda4b304967e772e9a683ae343d5524fe3c0f6c8308e519fad3ff3
font_02_sfnt_off0000fcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1