Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8213929a070a6bf…

MALICIOUS

PDF

80.4 KB Created: 2021-07-06 21:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5e24ce6fe018dce0d0a3bf849178c467 SHA-1: 01ab29d9ac2a21908221612b6583a5f472cd959a SHA-256: b8213929a070a6bf5b2f0bc0fc4702857916468b7f66eb6e32ecc6ee940bc3e2
124 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external URLs, many of which point to compromised WordPress sites. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely to lure users to phishing or malware-hosting sites. The presence of multiple distinct hosts and the use of disposable hosting further indicate a campaign designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

Heuristics 5

  • 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
  • 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://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829a45cee99---bizedizokin.pdf In PDF document text
    • http://csc-020.com/userfiles/file/20210621053415_3h5tf8.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b15286893c9---74292954755.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/e1b043b9ac0d7c817175319ea7e6674d/67889394776.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/lerujar.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/51226442587.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/06519c9d09881de6e5bb4bf433840f60/57579236698.pdfIn PDF document text
    • http://richfieldhighschool1969.com/clients/868116/File/mugezegemenebolupufaxa.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079220b8b4b2---jejilerajagujuwokowi.pdfIn PDF document text
    • http://pronobile.de/catalog/file/bamemeninapeloropu.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b520157f593ab7c1f6f2de4dd60c5639/mixidetevukujovipuvup.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b010505e312---tuwepufarolazap.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/8705546790.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f86c32c89f---94626062073.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/0avct119t3d7afbclu0jt9eqj6/darufozizerenefiwezi.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/69406531637.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ade0f184c69---wozeroxinepo.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/45072052487.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/roxibuguzowaxubinasomawo.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/p4qv2n85cbhffknib150fggo4d/molivikoxugep.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d68fbdde4d0---13542364116.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be77dcaf816---xazikizalifudavititujejob.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c5ae4abe9---vopakeboruxetiwixuw.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/vojagawudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+meaning+of+vocabularyPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA8 17944 bytes
SHA-256: 913465e0d33dc2d61fb70d3c355faafca6d3aee6fe30c162ac8312c261ab33a5
font_01_sfnt_off000119f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F5 10900 bytes
SHA-256: 30281c6b5229c775eae347839e07d9a7825f2631a9fdba14aee8fb65ec57537d