Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cecd12bd660789d…

MALICIOUS

PDF

93.6 KB Created: 2021-07-02 19:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58dc5e7102f3cc509b3d89e5c7520bac SHA-1: 8f83e07e810d444c5963e88c01b80e1ef7fffca0 SHA-256: 3cecd12bd660789d07b108ecce3c54377507ec00d59c0f738493bf363fc3fffc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=the+change+up+stream
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16072ce1b85437---27710079271.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160833c559828c---wusivatur.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/d7bb3256aba61b056f0c1a86e58574f2/gogofipemele.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/e6c9f981e78a4b123bb1fb003926fe51/redelurunuvezilupema.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/4e5d1eecc3b7f41579bea51af6dfa3d5/vemiweruwil.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac4810ae9b---98054780985.pdf
    • https://dienlanhbachkhoa.info/upload/files/sajejixasakolojovafone.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073f47aabd52---mexevudawozebapaj.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b68a194220a---26025511408.pdf
    • http://rld-carbon.ru/file/69474043289.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad96bc71b4f---kovaserivip.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/273556f3952e78c3adf0a942a17ad2be/lojadoxafage.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/e7533a8fe6e4e7d32bd7232228df8c45/fesovenumigobifeni.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c68cc3d52d---63685196200.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/6279882ccddb02a051d1a30d2710ed3c/22064417049.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3703e561d3---didezozonafugogusowet.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607346b1974a9---rujibakinunujonowobojo.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721d3956fea---67514687170.pdf
    • http://resortcrimea.com/ckfinder/userfiles/files/70468227223.pdf
    • https://africanresearchcenter.com/userfiles/file/fupiriliguz.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087809499502---jagavisegegebebaxek.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 16792 bytes
font_01_sfnt_off00011ef0.bin
554509f4820032cb7194a39c9e8085a48f41d5fc5696ff3f8608c44072888841		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF0 10624 bytes
font_02_sfnt_off00013710.bin
f99ee4918a153359641c8a8e5911fb456b0660dfb50ebdcac405aecb1bc81b31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13710 19120 bytes

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