Malicious PDF — malware analysis report

Static analysis result for SHA-256 39bc352653059fbe…

MALICIOUS

PDF

78.7 KB Created: 2021-09-04 01:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7bb3035f6502a60d0083de4cfefb2d82 SHA-1: a8e824332a2556efdfe0108897057bd08b821f9f SHA-256: 39bc352653059fbe97fd038e83f87050298a87757923184904506da6067b5b1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs lead to various PDF files hosted on potentially compromised or untrusted domains, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b98b82653---kewosiranifepined.pdf In PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/88110483939.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/39894633199.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/757e72caa37b6730aa2e9ba0a76a70ac/1186673533.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/339947283.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/tunubokot.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/zomovagebuvewawunaturu.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/refimexunonetejeravupo.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/katevoxe.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/xiveliwi.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/powesetexilejoxoboketeji.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/jemozexikilitatanafu.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/famikowawidima.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/rbhj7r46fkcgrn1q265grnmttd/tuwobuvufozipidoboxopazij.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/dde1a1f0052c691cd3c23e6e074b3bc9/66380747453.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608db0d46abdc---pifugivekibivoxojitateneg.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/50354040430.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/33292684489.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094d1e314a13---dawabewekogunobow.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/57313845709.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/3473234947.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/24486923334.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dd6246eee---dukefigijeka.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/8qlf22leu8opf4h0di94gf8br4/runujasarivaba.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/65297849533.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=panasonic+inverter+aircon+instruction+manualPDF 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_off0000ce6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6B 17684 bytes
SHA-256: 9503525fb9ac0f60f0c7958c91b14345203979ddfde997da2db87f82def11962
font_01_sfnt_off0000fc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5C 10560 bytes
SHA-256: 4f552f34959c1d2168901387f4728656e5be0a71dee0bd4d2a9cc1d55aaa2907
font_02_sfnt_off00011487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11487 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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