Malicious PDF — malware analysis report

Static analysis result for SHA-256 32ca5a202e059153…

MALICIOUS

PDF

88.5 KB Created: 2021-06-28 17:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 953404b33f96d1d0dd4a3ff6a8298884 SHA-1: 0caf21c73d204fb1b612cb837a7252788ec90c18 SHA-256: 32ca5a202e059153827587aeca2e1fc589d2e2be262888dcc08f17ceba82de29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document delivery, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://crewmak.ru/uplcv?utm_term=why+is+my+new+freezer+frosting+up PDF link annotation
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/96188515028.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/iid2vncgojdhmgo2sahrbvuh20/kaluvigibatizugalumikor.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa2cdff4e---wejezomepotusakitudew.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/jutixuxadufijevelopiwu.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/162e343dcdf0883cf426229481d05c3d/70432490382.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/vetejusedisotubapuzeb.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/sofadoxajupu.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/85323476673.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086204d3871c---balibojefotir.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/73849458111.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/6346dd9ff5b684ee48cdfafde1c25eec/lovoxopefotugoxig.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/30990948039.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/704f24e7638cb6d77168117e37cb7625/rasufivijop.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9396e18b7---zekoponarusufesomubotok.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/m65qilg1k95smncc52uegqk1ge/96060999586.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c1d42f49f---48700838596.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/2j5jfq0opfs4o76fkfh23gimg7/zugijomojubavuf.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb296ceb085---tepoge.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4fd920b58---35217032720.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/re9t8teoknc7h8u0vmcas21853/43206184806.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/wabosaraviwuw.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a2b7cdef4---jumedilexi.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_off0000f740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF740 10948 bytes
SHA-256: 817295f0d0270fa29ca5aa0b9b2b560d84aee954f630498d1de632c6921c151d
font_01_sfnt_off00011093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11093 17032 bytes
SHA-256: c68c1add411681e300114aa49220ee10b341b5b4ccdc749ea2c737ba5c54cf2e
font_02_sfnt_off00013cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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