Malicious PDF — malware analysis report

Static analysis result for SHA-256 8471c4ca8384a5d2…

MALICIOUS

PDF

70.8 KB Created: 2021-09-05 05:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c1cd47e53fbc6efd96583573103be790 SHA-1: 90821e678033ce2419c5ab1909becd228e9a177a SHA-256: 8471c4ca8384a5d2fc2eeca9ba2b71f34137415b3453f994c442e33c40a7d77d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm or redirection scheme. One such link is http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a440fe2ab5f---80781302369.pdf, which is a primary IOC. The PDF's structure and link farm behavior indicate it's likely part of a phishing or malicious redirection campaign, potentially using embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a440fe2ab5f---80781302369.pdf In PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/3il00vccaspjidjve9u1bebm94/perirolida.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/lotaxasexuwomuvu.pdfIn PDF document text
    • https://gencatakan.com/upload/file/rusiwokigevatofesa.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/8032227934.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16085ee4a1a8ef---16825787868.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/rowapufiripogigub.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/19239999882.pdfIn PDF document text
    • https://podimercrm.com/img/files/zobarix.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160728cace30f5---20243971573.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/19091865978.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81721d4aa---3050133465.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/86928210643.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/durefivozowixideperakaru.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/subobumapos.pdfIn PDF document text
    • http://wearebryants.com/clients/3/3b/3bb22ab34fb8fe691aabc4d0498f9caa/File/80514275900.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/befajuxonix.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/2i603hqd20ji08taka4mvo5hb5/37105309626.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/6fbhtpkbed8ge72nnet9o6guc3/56916010983.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe4589b08e---47736207639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=national+environmental+management+act+south+africa+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_off0000b2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E7 11208 bytes
SHA-256: 1535c62be15333e2076f034149ff877254e630b4d8f676118580aaf929eb4a91
font_01_sfnt_off0000ccc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC7 15948 bytes
SHA-256: fff33906ccd313b9657a4da813823b5790c24740d123118a363bb293541b785b
font_02_sfnt_off0000f576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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