Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f64876de5077088…

MALICIOUS

PDF

176.6 KB Created: 2021-07-08 18:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 563e6e3c974543b8a1cf4a197211d286 SHA-1: 3acccf2ce76cebdedf69e62d06aad72ef1a231b2 SHA-256: 8f64876de50770888bef98995aee9713ea8d33955f42d07edff71053c9a00d62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm patterns, with many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9652

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://synerhu.ru/uplcv?utm_term=tested+by+fire+bible+verse PDF link annotation
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c05d7be7a---62003083050.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a5ea788f4062e270a1f2c1ad54600663/15339292939.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/sgc3hhb5vemt1ifj72arg5l99i/gubeborinizaboveg.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/14132610783.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc0647622e---60740184162.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/98423233925.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/dugovivepigibumefe.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/widosipipabopep.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/08ff8dc90bbf203d68ca2c7f3c77b14e/40546181225.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/femidawanijukifezur.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160943fef85a24---pudezovurujejodokutoso.pdfIn PDF document text
    • http://keysrotary.com/clients/d/da/da683cbc30bfd632b0b364d14bdd38fd/File/64025527303.pdfIn PDF document text
    • http://freeski.hu/freeski/file/81028162554.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608019eb3bdbe---76314276183.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/b70f32da4701b1d7607770eec57d2c39/soxowudigikige.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958b73df4d9---favopajurutoritotaruvof.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/kubitex.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4d32a7a31---mafubozobog.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/fd6c8a5d0891189d57b765e64c4ac6f4/kofugemunufuzepuweji.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/woperabime.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45d4c7ca9b---zadosazomazufaduxewokeki.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817056d62d1---bewatinuse.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd74cef412---vasobisekovufozaduluzo.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/45276377888.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160cf805a73462---teditewo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00024825.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x24825 16304 bytes
SHA-256: 6334c19641ef1231d1524c06eff9581bd03d2dbdcaeab47ad2639540436723a7
font_00_sfnt_off00023014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23014 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00025e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25E66 24564 bytes
SHA-256: 48533d3d3c338d64c066e65591fa2b4ff6a8f87a648a615c69e4ee06b347fdfd
font_03_sfnt_off00029d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29D22 10244 bytes
SHA-256: dcb21979e421817a2af22f870f948ef80669e10999bfb495f01356384c0c58cd

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