Malicious PDF — malware analysis report

Static analysis result for SHA-256 5421ca459837a3cd…

MALICIOUS

PDF

89.2 KB Created: 2021-06-26 21:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 186c7044d062a04935aaf69b35215768 SHA-1: d5d6b22b351aa966ba175616128dcbead7127d82 SHA-256: 5421ca459837a3cd0e456394b8ba3d70348047507e45ad1863cb38bad5105a4f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://morard-mcf.fr/data/Files/10336367448.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/14bd1ec6723a18a74fd740774e668a04/28487899022.pdf
    • http://ctkupavna.ru/upload/file/90465183525.pdf
    • https://bloomland.com/sites/bloomland.com/files/40951557925.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/e2vp12rnlok43f3au2o87bhi25/37306325888.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/e93a9dee37e718f4177830e77b991980/niwusomezefiki.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37c7290335---pivigowuri.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607594ddc4125---vinak.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b12032751af---minisesesaxeronelo.pdf
    • https://ikincielinmak.com/upload/ckfinder/files/13729156596.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607921e88de7f---mudivapezimadafopi.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/386b49a95fc1bc42ee20fb6a81fe6d4c/89831519020.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c902b71d72---nagipomu.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f8ed1c7b9---76762441373.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/64fudfcl9stsk5n7003rsjvsbn/10548648509.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/64de327e13aea1a101d458c3b07aa61c/78658739207.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/119adafb997218180153ec6ced3cace9/zunizoboxama.pdf
    • http://sharise.net/Uploadfiles/files/pegevizanokulaw.pdf
    • http://beachhigh65.com/clients/879402/File/tunokixapilaze.pdf
    • http://chatfieldfarms101.com/userimages/suripelikorali.pdf
    • https://pharma-tools.eu/galeria/file/vekuduwif.pdf
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160716d3af1bb5---91352244209.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/3815b4a3b5b492e4d88005b7a86148af/zonotilu.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8bf0a4964---70941925958.pdf
    • https://ddshower.com/ckfinder/userfiles/files/54883944883.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/50f57bc2d355ee8bf832b68a3674114f/xujov.pdf
    • http://asja-doll.ru/userfiles/file/dizutasanik.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pampered+pets+boarding
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F7 16792 bytes
font_01_sfnt_off0000fa09.bin
abeca237509cbf6bb3231927a2360147a06b85cd7e80a246aaefa7325391ae32
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA09 17720 bytes
font_02_sfnt_off000128ed.bin
eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8
pdf-font-stream PDF embedded font (sfnt) at offset 0x128ED 16132 bytes
font_03_sfnt_off00013e5f.bin
3e66b31781085a16bd7e5187b0679cd209c3504e8ea65d7e0385d0e66e1bd7b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5F 10832 bytes