Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba0e082a3fecf232…

MALICIOUS

PDF

95.3 KB Created: 2021-07-05 05:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 91a266d1ea9c569faec02bf6b8bd1231 SHA-1: 487258dcf5685fc007d24e1bfbae34a863853878 SHA-256: ba0e082a3fecf2326162329bb092a9b7e67ce14afadd37ab7e2ce0920210f817
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://inwebjor.ru/uplcv?utm_term=mtech+in+foreign PDF link annotation
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/37747788eb4777bac18708db433fd1f1/bixorepejetisapamutu.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/13003960276.pdfIn PDF document text
    • https://hgb.se/filer/file/nukusaton.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/rasejan.pdfIn PDF document text
    • https://33mobility.net/uploads/files/95320425358.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/199c19a4c8196527738e675815c200d6/85413635597.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e47fbc47c2---97774041677.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/2f58c30b91e458130fc9b9a44040cb63/32960785048.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/503d5f0bdc98dd51dcca8c030d8bd572/1799101187.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/65572340205.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bca9ccc7af---joniki.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c1ae6baa3---74047439232.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce74b56818f---4530278751.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/cd842a34d5ad7a1c4c90625a6ab16358/30178376707.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/badose.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/50434502082.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d55eefbb2---55476507481.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609433d8ced6c---povima.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/15313252887.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a637af05677---90717658909.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/3a814944c71b210f076f81bca6634f93/41980821510.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/bmou6s0ks235b5odoghbeidbtp/76175018436.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20216181028517685.pdfIn PDF document text
    • http://poorclarescork.ie/images/wufojonevorovegovomapole.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/f7fff585f68d789b1b631f2a695cb35a/93749646416.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/d18f384de525a6c1fac48dadd49ac304/59874649047.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
font_00_sfnt_off0001083c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001204e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204E 17924 bytes
SHA-256: ffb403c18c922f872afada80752521b42e40dd1a717b662466d18f173f7a4d3c
font_02_sfnt_off00014eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EAE 10232 bytes
SHA-256: ca27c556efa9e93ee4a7084a949c7ebb43ced2928a3600c926bdc5045892eb90
font_03_sfnt_off00016591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16591 2284 bytes
SHA-256: 58c54db95df463f94b980f5006da3240d222427a8b0d8326c1722e362dbf54d3

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