Malicious PDF — malware analysis report

Static analysis result for SHA-256 9491873590673010…

MALICIOUS

PDF

90.9 KB Created: 2021-09-17 22:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7ad4b4150a1f3420633bf7ad98d50538 SHA-1: 3be706b23e4e5d1c09d64b8d6d899cf043655244 SHA-256: 94918735906730102e311e8c7007071d6c285fb54d374bf3f25b4c4661875e2b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or SEO poisoning attack. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and does not provide direct clues, but the heuristics and URLs point to a pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614138deae812---85788270385.pdf In PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161375081493ce---selowulekasulukozilaloza.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/famokajorojugaxegubaj.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/17552240740.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/90056112747.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/pejifonuwenij.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/rexaralarukiranubum.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/saxabepivax.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/jijoz.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/50630688527.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/46572431444.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/damonajiruv.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/96978876296.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/9tpb1ne3v3p7ep5tt4h8po5f3o/16269749799.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16143f4bd0fc25---masemexuboladewazinojetub.pdfIn PDF document text
    • http://tulga.ru/editor/files/96451503083.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/51717398391.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/tuwibajukegekirosusol.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/75147775133.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/beletisaputat.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/korakuperesopofuvor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=123movies+me+before+you+full+moviePDF 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_off00010257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10257 10676 bytes
SHA-256: bbc7e62d9043573325aa7a57ee17772234c3562088950a6a8538d82452ff56ea
font_01_sfnt_off00011aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13300 17228 bytes
SHA-256: 054e15310867f1eb04cec070fb3ed1bb86260c5cd997b1bbd0cb2b03c371eda7