Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3451eea5a56b7c…

MALICIOUS

PDF

174.4 KB Created: 2021-07-31 07:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 443ed1a353c7cf9dafc08437d458b050 SHA-1: 41a244d58cf749d110f04722e8c2f087e0bb6d6a SHA-256: af3451eea5a56b7c5ec33b990fd573ab4454ba72c11d4dc542c6da2e9bc2eaf2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous links to potentially untrusted domains strongly supports the attack pattern.

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 http://gaziogluenerji.com/images_upload/files/75718623665.pdf In PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/97783481091.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e9b39fc83---nekitusaxanixomefuru.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/72859913867.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/d6845a1d864e43929062090f4c1184b6/5171005301.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/21cfc18b347dd196a8ab9e4ca1cc8d44/9850746671.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/sitizilaveg.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/75318320447.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/rubuparegolodivajigufegat.pdfIn PDF document text
    • https://businesslife.com/content/file/doxoguk.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c7d0c0a72---jokikogegaduzoluvasupiji.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/reloraduvipupowasumevuli.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/86be0408ef337528e27203e665ca27e6/60546180614.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/c2b049d90f72714b4c591d82dd032268/51542780784.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/88669509200.pdfIn PDF document text
    • https://isosklo.cz/uploads/zotimu.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/xuxutapalozura.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/gu0tu919uppb49o89q0p5htq00/vilam.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160905a3127894---lorozegivo.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/68999330082.pdfIn PDF document text
    • http://longearedhounds.com/clients/65743/File/41465547730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=acta+constitutiva+de+una+sociedad+cooperativa+de+producci%C3%B3n+pesqueraPDF 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_off00024437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24437 19688 bytes
SHA-256: 12ae3112b334509471bc8442ffc667b953936fff61feef67d922ff3f954fd5fe
font_01_sfnt_off0002766d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2766D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00028e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28E84 10892 bytes
SHA-256: 4bf3d21767fee54500802273b8b18585901bd77c2d7a9d427fe9b5f7677ec316

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