Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7db29b151a93334…

MALICIOUS

PDF

101.0 KB Created: 2021-06-26 03:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dfb5b7ac064432831d95555534e2eb2a SHA-1: 5ad0462d8a4ff86fe0bd19e75bab52d7cd58bd47 SHA-256: f7db29b151a933348cff362223af1d9b42e0b6f620b3cbf7606279dcab2be696
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://pistant.ru/uplcv?utm_term=square+root+of+156
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/d722a1fe98486b0a945793c3d74e9de7/34610921651.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963faf7a5c4---84397267597.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609158c46deb7---58764993841.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/cc11e16beac669fdd0bc4093e8885aeb/42723305409.pdf
    • http://rauvuonsach.com/images/uploads/files/dedidup.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/5571b7fd9b88b5b2587482b30561f125/weporasulagipokojap.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c238d69e972---33863573421.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d7418d6e4---70973936168.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb43786ec4c---xubepojawitupukojo.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e3fd7c0c0---dunosefamonafomubed.pdf
    • https://twinslock.com/ckfinder/userfiles/files/zazot.pdf
    • http://littlepearlspublishing.in/data/eimages/file/vazijalumoxutoduzi.pdf
    • http://nuestratierrapremios.com/campannas/file/33922163521.pdf
    • http://azizolace.cz/images/file/malejazezejolonigib.pdf
    • http://brenno-tojestto.pl/userfiles/file/xalomi.pdf
    • https://prestinieurope.ch/userfiles/files/40923547425.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/qps106lo40qquuvc1dl0b33lu2/38377078035.pdf
    • https://myphi.biz/nbloom/fckuploads/file/77694109795.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/v6jmf8plmu87vvbq1013v90f26/supebolawamozanajujubo.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/9bb5e9c7640f0c4a69dd04395418ead1/22596807877.pdf
    • https://tractorpulling-emmeloord.nl/upload/file/81797485171.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/52f51e306aaa54e2b9fea6f04c2f4e72/wemojofinukadadekuvunux.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c144a1864ba---vesitarawasapujufer.pdf
    • https://itandem.net/ckfinder/userfiles/files/56321909653.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076e5d2a10bf---vemulomazozusedejufutufoz.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_off00012735.bin
057ac83bfdd1f7416aa72238aa67708f6458454fcafed64197199e17b917ea00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12735 17740 bytes
font_01_sfnt_off00015560.bin
6ccbd5e9947d86052d1a8cf8299018099d8ab1c5836743e8c21162cf3aa677d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15560 10472 bytes
font_02_sfnt_off00016d77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16D77 16792 bytes

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