Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a6c8b567777ef91…

MALICIOUS

PDF

84.1 KB Created: 2021-08-07 07:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6e6a10462f70f98f16058db88c090465 SHA-1: 29f80db8302b4e68a81527ecf48297493615aa1b SHA-256: 2a6c8b567777ef91965d19c1d76394df3d2fda1ab5dc7c9a0ef4d2b65fe1278f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS upload storage, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=sukanya+samriddhi+yojana+form+pdf+bob PDF link annotation
    • https://auto-rujo.com/images-editor/file/15469924247.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607587d697478---65859676292.pdfIn PDF document text
    • https://atl-50.com/files/file/50607178001.pdfIn PDF document text
    • http://slsnn.ru/content/file/93361008865.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/49289999744.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/depopab.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cabaeb5ac5---22350514015.pdfIn PDF document text
    • http://healthywithhart.com/res/file/wigemesog.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/46025404235.pdfIn PDF document text
    • http://flomojapan.com/upload/files/64127711486.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/96381663119.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/41449492226.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09a8b84ef3---weripojijowirirofa.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cf782995b0b---jifiwejipituku.pdfIn PDF document text
    • http://dzbnf.com/upload/file///82636674980.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/goxixaguxodelonukibebogof.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ed1047440---5141277512.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b3b7f0702---rulusuwu.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b1f8533ba---wurulamaper.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/nobabum.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/79982723540.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609939d836cd4---69625885320.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_off0000e311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE311 11136 bytes
SHA-256: d175875bc8f5762f495e8b6c74c08c21db68c092b5f93e7ca63deafbe8e2a98c
font_01_sfnt_off0000fc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC89 16956 bytes
SHA-256: 1099096f82dae9884a8be9d640e50503ade7026cba579d32a719b8ab0c463129
font_02_sfnt_off00012905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12905 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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