Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad5c36d8c828831…

MALICIOUS

PDF

71.5 KB Created: 2021-09-07 19:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d549aae0d4b689ff9a99eb5b8df5e708 SHA-1: e7f5e0c316e4d199a7a1b16473fa0cfa0b67ba69 SHA-256: 8ad5c36d8c828831168e4b8bb27617e0dd47a4cff8bc2d42c830342a4bc5be66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=manufacturing+of+hydraulic+cylinders+pdf
    • http://dc-28460bd9dc5f.liebes-map.ch/ckfinder/userfiles/files/5907920703.pdf
    • http://form4concrete.ru/pics/cont//file/68712568213.pdf
    • http://unipsyclinic.com/userfiles/file/20210730011434.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad92d4536a1---xurowerenidapunijofuki.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/aed46081bbdf64f4e69855676d5daf31/pobexizuwejejer.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792ba52901b---xasixexuzidesa.pdf
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/mukuzegesurosurogej.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbb9f154fe---rorekomowuxidol.pdf
    • https://megatekspb.ru/sites/default/files/uploads/kevovozakesivubo.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1412872b7d---rojimozuxo.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077d91781937---1754373224.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/gttj95sbviqs808fhd9m92ekiq/webigujifamigawisozod.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16099dba6eb48f---badube.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/r42835e69qcaab6ic59sjfht4b/83961130077.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/rlk2dkgc2eanjeibj5q4pnvksk/viwagadewofirovegijo.pdf
    • https://clinicamanila.com/ckfinder/userfiles/files/75515312512.pdf
    • http://theexplorerthai.com/userfiles/files/nubuwizowejasubanizosafol.pdf
    • https://hyundainhapkhau.vn/upload/files/29173263986.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6a50d4baa---borewef.pdf
    • http://tramtronbetong.com/uploads/userfiles/file/vusisikugowobiveta.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20e08a6a98---17235083298.pdf
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/kozufunejimo.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/e564aeb8e36a6b6512e3fed7425ea9dd/sawonavogivener.pdf
    • https://digireg.es/upload/99946431067.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_off0000b77c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB77C 16792 bytes
font_01_sfnt_off0000cf8e.bin
3d8bf2dfc43a55db9d81aa29b44e3c8a08bf52962d3490df3ee8e84333cfdfc5
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8E 15404 bytes
font_02_sfnt_off0000f688.bin
ab22d5fb002b612e3547dfdb6f923c38c6b89df81807cab739bdbc61a1ffa8da
pdf-font-stream PDF embedded font (sfnt) at offset 0xF688 11108 bytes