Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8fa16ceb5e4ee8c…

MALICIOUS

PDF

71.9 KB Created: 2021-09-08 07:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 17b21f6e7a652e9be3a1ef1fe2966b78 SHA-1: 326c9049ae9870fd958995e75c588b4132a0fa2f SHA-256: b8fa16ceb5e4ee8c1ce3b27da99cb01e6a089c3ad8c62abc75a5dca2c7c5ba00
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://zzzwchem.com/upload/files/retefasejewa.pdf In PDF document text
    • https://an-professional.ru/img/files/file/31265076810.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077e9f813934---81351283370.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/zopipulurakotukefewutaj.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/tobesexezavudu.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/fuvasezug.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16084ee4870c96---87770253667.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160817f1d1367a---69610692982.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b11b8fe4f---redikefugemagemanin.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/312c49b1132490ec9d40d82794f6b35c/34029959344.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/20196490816.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/dowafolediradukep.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/61147923449.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/21151038671.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/62860985845.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/93959158078.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/86977055966.pdfIn PDF document text
    • http://fuli-capital.com/userfiles/file/13127052909.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/98673888287.pdfIn PDF document text
    • http://deltools.com/userfiles/file/fusamajunineni.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/85e0fd1612bd924c0fb3bccc2a91316e/22367750465.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/tepagida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=goals+vs+objectives+vs+targets+pdfPDF 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_off0000b880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB880 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD092 15756 bytes
SHA-256: 8e9d69c098aee76da3ad3b3c4c2de29a4355fddd6232f2099029c18ed4d70af0
font_02_sfnt_off0000f848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF848 11064 bytes
SHA-256: a17c6e2c60352139fd3917fdd319d79f2c136bb2ef592bad5024e265e89dca73

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