Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc3dcf2f89e420b3…

MALICIOUS

PDF

94.0 KB Created: 2021-06-26 13:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2888dc4afdf0c9d288a4e84ff2b46bc2 SHA-1: 27301fd3db192cd4db4caa002b7681068371f1a6 SHA-256: bc3dcf2f89e420b335f90aa4cc2743d8a753fabdd705a84b4dec0422b573e5a4
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files, many hosted on compromised CMS uploads. This structure is typical of phishing campaigns or malware distribution schemes, aiming to lure victims to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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 http://henri-ruch.ch/doc_pub/file/xudinelifizivalusozew.pdf
    • https://abugfreemind.com/userfiles/file/27821794048.pdf
    • https://businesslife.com/content/file/61004069788.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/d5184b6c51719ebe74fc93c78c9efa4e/jofenipegejefujom.pdf
    • http://accessiblevehicleservices.com/userfiles/file/60427075355.pdf
    • https://khanikango.in/file/zuvasotuz.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/mnlv2tvcjmmd47pe89oso7abj8/93201187942.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7ounuuj2bf8rk6gd658tig3df3/33853947001.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/d7bd3dba4f0bea35234bf075a6b7b566/gurutajip.pdf
    • http://lapenya.cat/imgjovesnaves/file/30175124087.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b67ad2b2d0---83938293248.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ba4586bee16d1290eb4be69faf6b4649/vazezepuzilumaso.pdf
    • http://tlxzkj.com/uploads/file/12182009927.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e81b5e223---26621143971.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d66aead869f---gojisifisigij.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0b3f55bf0---xatomewaxigutonesusule.pdf
    • http://krevue.cz/UserFiles/File/73580292420.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/e8b6e1867b55336a34e267fbfc67a922/datozobaluvip.pdf
    • http://goodtraefarm.com/ckupload/files/62652127115.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/9ruaflmv6vfeul9e0pphfe1ce3/sililiwusozanesurulam.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0b7271874---tukudiganotufilefad.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/memuxefonijezu.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/c0bc6035764ac6747abbcc8e2e5a65c7/sogonuliwigovepe.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609975f83379c---fojejufuzal.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b6eea8f9c---96202483552.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/7d1593dba5c48f70e9d38c81b6ea14bc/farajidesegow.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/e70456d39b90ad00a17988f3263ef2e5/sutovudikukolepuvemikukoz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=military+base+in+sumter+sc
    • 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_off00010ae5.bin
7d58aa7a3fca86b961d61481f688ad924e2ed531eee88ba8baf5bc5861ecea12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE5 18220 bytes
font_01_sfnt_off00013a6d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6D 16792 bytes
font_02_sfnt_off00015284.bin
115595412e1ce84abe6ec0afebce60f32a004183c32c4e40769332b3764cdb43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15284 10620 bytes

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