Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e8c02a090f8634…

MALICIOUS

PDF

87.6 KB Created: 2021-08-08 16:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 58d73b7a7259a58d67d7cb2a0f33a10c SHA-1: 11f947da8e618569bad0b6ed9d59e7aa8daca86a SHA-256: f4e8c02a090f8634a0ca2183c00619951db465c96c773f04cc17134a474d5781
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://honda-vo.com/upload/file/41886046558.pdf In PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/raletizutu.pdfIn PDF document text
    • https://alohasafaris.com/files/49139924197.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/be9ed84ff804615bf6176f64390c7a4c/rigemekivaz.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/mqjihfcsqht3sc21p4ng9imdup/30820824530.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/64998285003.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa6ea78d3b---57320077047.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/5qq9agaeuv3pk9tge9f9glsp3e/fonanizivobizesodit.pdfIn PDF document text
    • https://le27.fr/docs/file/zevitipupefatajuvafigu.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/407abe235099041c865ba1a04e786f61/watepivo.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610440a482842---virobukokevo.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/51365745547.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/2ckgglv15s441a6qpf0ahr4rh3/mojilapaweb.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/cuuq5h0n3qj2t1fme9cc5sjhnk/balumupadotigapizo.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/eb3094749b130858587e5bbcbaacf1d4/37987150386.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/17234476027.pdfIn PDF document text
    • http://carbonelite.ru/file/52614138196.pdfIn PDF document text
    • http://kelvista.lt/images/files/50740871238.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/40166034587.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/57663425885.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/12227430866.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/juzamudiniwogapokik.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/11916477825.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/a178c6c66f89fd9f507fe55f95417928/kulaxovunek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=uber+app+not+showing+bike+optionPDF 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_off0000f0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10900 10808 bytes
SHA-256: 5bc32faf1537d89438bee18020a6fa9202808ae1b63b615c275c92a3c245b58b
font_02_sfnt_off000121b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B8 17520 bytes
SHA-256: 059d01ebbde9eaff63ad2d3309522ae8c8771c3c6f4383f52735ba255096feca