Malicious PDF — malware analysis report

Static analysis result for SHA-256 67951f29ec9c3f4c…

MALICIOUS

PDF

85.7 KB Created: 2021-07-15 20:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 380fe8f1b060f9d8de5b5ff2e483b8f2 SHA-1: e39482fff8506e8f18e0fbe4e07e596e99fbb97d SHA-256: 67951f29ec9c3f4c6664140eb0d27cf2c8d767a20ec2112c07ac77b519d4a692
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous links to potentially compromised sites strongly indicates a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16078a62c16921---peputavirojowekukado.pdf In PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16076245db8ff4---papopupakojetirovifi.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210625_0718DD20EA3D6F69.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/29245689922.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/78048184796.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/pobapidefej.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/47339454511.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a78a7d3c89b---10368848090.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759b6176d70---lusugizifenilonevukatilam.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/163518ab61d16a5bdd2141b1f502856d/17974473314.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/vinolazekuxa.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/zadogebalaru.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b831c98bb---7701568176.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/vafuxiret.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/1d5502600333bfcfd736912f5bce539c/19566182651.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/19418213037.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/94070382661.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/oqrjsjtqn6r7grp4qd8g1sh5l3/kalamegobesiratareludefa.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/40452882962.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d23624e15d---volafobofefanasepotuvi.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/8e5d72bc9f541bd7471b4db542691ce9/19526614346.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/xifis.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/radebovirifer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=round+robin+betting+definitionPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/75566385674.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_off0000ed30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10547 10440 bytes
SHA-256: c419ef8b26dc1ed35c14408cd8dc348baabbc4000089d3643e7446f053cad896
font_02_sfnt_off00011cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD7 17312 bytes
SHA-256: fe9b191d165be4070fa63f8b584878b7f18a25960ac0e343bfc70a5b0aedcc85

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