Malicious PDF — malware analysis report

Static analysis result for SHA-256 f59b26ee1fb49195…

MALICIOUS

PDF

81.5 KB Created: 2021-09-02 14:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f3c4375d32d12b00935b50a3ff6b91c4 SHA-1: 5c457a8bec57785c1b213abc4289349eaf9b933a SHA-256: f59b26ee1fb4919556e693d32a1b58d992d1cc6bfc12f3d65b11e51e211d30f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the presence of multiple suspicious URLs indicates a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/bl70b7v9mh6v82tbatj2v7ajmk/deroronog.pdf In PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16087621173e05---34145750285.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/dagaxir.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/87060926331.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/fbr1oavvd5dc6fbispdn6lnver/71942466910.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607498d5a6c6b---37817857215.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077057183396---duwabenizutubujux.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/69410656933.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c490f31833f---2306087957.pdfIn PDF document text
    • http://reflita.lt/uploads/files/fatewajejoko.pdfIn PDF document text
    • http://lactopad.com/uploads/files/14109988941.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/jidalefebimulixufi.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/8017765098.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/rozug.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/gizipiw.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/pekatawasefurixovizoki.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784638549dc---9061040607.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/q8dkr630bpd8uvuqt4av06lo3a/rasodiregipodujujilewuk.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/85751783644.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/93a72cae5b87c015b75b25c06ba6db00/60572380329.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/85145268853.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/jibolujuvagixutixirupen.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/fesedemipilunizevul.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/xojimigizetupogem.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/96675476450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=price+effect+definition+pdfPDF 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_off0000da4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25D 18116 bytes
SHA-256: 92cf0f8381883cec5c38eb310b7add8c729d2f8e351d4f7e8f9d9790a067510b
font_02_sfnt_off00012185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12185 10236 bytes
SHA-256: ab0e75fa8bc616f0b75061920393ffd203f1bbea208bc3b3d185ea6e9896e7e2