Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c063eec94cf68bb…

MALICIOUS

PDF

82.5 KB Created: 2021-07-20 18:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 777f977b6c785bfaae26d9c10ce4c7d7 SHA-1: fe2ce9844024acd7c2471519001afd8f6b2f2956 SHA-256: 7c063eec94cf68bb139961d09b3ea535192f3952060b6747435fc5fcc0d7cebc
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or SEO manipulation tactic. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to distribute links across various domains, likely to obscure malicious activity or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://camping-du-lac-dijon.com/fichiers/tivijefejutefomipivaje.pdf
    • http://i-harmonics.com/upload/files/kaxivofilole.pdf
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/wujibusemuti.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607e917087afb---tejebame.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/eb0c2e4258dfc410f1008f6041859ed2/45543901646.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c984227966---62912215520.pdf
    • http://allamericannursing.com/userfiles/file/6234280132.pdf
    • https://abicecream.ru/ckfinder/userfiles/files/tazalosarewizibuduje.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d549bcfdc1---zedaruxoguz.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/816ef91f758f6a3bfba5115b2348da02/47398025380.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607705b9b7570---32540125755.pdf
    • http://alphasigmaoverseas.com/userfiles/file/lasugezivutavegapato.pdf
    • http://hakkabrothers.com/userfiles/file///satonope.pdf
    • https://bdsvieclam.com/upload/files/legojogiw.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd776ad3d2---wixenemeluzelop.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609582d68689a---laroxigutuwutelogolopuv.pdf
    • http://retroldn.com/userfiles/file/63897698565.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/a7758e1b195bc14a7999edbda8fb006a/7827918889.pdf
    • http://artetendasud.it/userfiles/files/sijovesumejarotewag.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c2213cc3e---3820454597.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7f447c0a7---dewamenugona.pdf
    • http://acsalma.hu/userfiles/files/viwemuref.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/cfv43cpspgc2uecgetf3l5r0e5/63832371567.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=stomach+tightening+22+weeks+pregnant
    • 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_off0000dc6e.bin
fbc3a21dbed714eb712f9861cddf8b8c198ef930746eb35e7bb9abf00b75d218
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6E 11148 bytes
font_01_sfnt_off0000f66d.bin
60ed1e2747d9cf440db1262643204f8a9232cacc6dc6d4304f5b8981ffa55d20
pdf-font-stream PDF embedded font (sfnt) at offset 0xF66D 17800 bytes
font_02_sfnt_off00012496.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12496 16792 bytes