Malicious PDF — malware analysis report

Static analysis result for SHA-256 35cb2e0d7d445842…

MALICIOUS

PDF

75.7 KB Created: 2021-09-08 04:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: aad55a57936223233b4c923d4ab8feee SHA-1: a2ba80345bf4537c229cbf702ca1efce10730184 SHA-256: 35cb2e0d7d4458427984406399ebde64c61a1b8daf17e779cb8aa35dc5bb2424
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit users via external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://fincasotilloviejo.es/files/sotillo/_repo/file/29182823974.pdf In PDF document text
    • http://zap-interactive.com/uploads/files/namekapaxumitubewomuparo.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/35b5403d1a6a04b7719888eeee9bddb5/zozunenamiwitupot.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5d251c5c9---99907012360.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/sokudajegisabarufolunoj.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/802344ac5b4f8011b9b0c6cfbb7408bb/maximinisulutefogiwep.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/684c6d2d20803baf64194abc734994ca/72813079237.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160732a1f0ae08---zagumejemunaludeveme.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fcc10ece4---59809203984.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/91600892729.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/pajenebizapite.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/xabobagesupirefotukosejep.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/fefijitijiniduboxidex.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/zevesum.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/fijejegasip.pdfIn PDF document text
    • http://krupongs.com/images/file/38142667928.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/be39e8b6cbe65bb86c9d5173a508a031/78882088623.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/96611990867.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/4fdc37f04116dde25032001c6097ca2b/likesagubeju.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dc2621bb5b---gajudino.pdfIn PDF document text
    • http://silver1979.com/upload/file/63263056036.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/gorojixozuramitumareta.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/gemurufusesap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=microbiology+practical+book+pdf+mbbsPDF link annotation
    • 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_off0000c002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC002 17552 bytes
SHA-256: 6f774d17645d310a68d88e45bb843869901dbb42e160e3e56239dbd3523662dc
font_01_sfnt_off0000ed76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED76 11064 bytes
SHA-256: 507a39deb9fa9699de01ccc6e58ed945a15d57258f0cd48e6131a18c0bedfe26
font_02_sfnt_off000106ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1