Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2fff339cf68dd38…

MALICIOUS

PDF

79.1 KB Created: 2021-09-12 23:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa1295debd12166fc2330672e298226e SHA-1: 6b3ab264f04d7ff00da877a0e00022c90bdb7537 SHA-256: f2fff339cf68dd38a5069b34942745b9d946fb83e8e0a9ff881e5028463fb4cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous URLs are embedded, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://drafthe.ru/uplcv?utm_term=vpn+tube+apk
    • http://autothudo.vn/upload/fck/file/lumagi.pdf
    • http://denkobarbell.com/_upload/files/87718261646.pdf
    • http://telegid.tv/userfiles/files/gidevabunezasaxo.pdf
    • http://rasciindia.com/firetech/ckupload/files/49307773681.pdf
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/rimusevimunuz.pdf
    • http://www.romanschatztruhe.de/img/files/dikufazokate.pdf
    • http://grgct.com/ckfinder/userfiles/files/gazumabugokiselabisitanow.pdf
    • http://husplaza.hu/editor_up/wokoridasigogenesibe.pdf
    • http://ladna.pl/user_images/file/69219344732.pdf
    • http://bephoangdung.vn/uploads/ckfinder/files/bojovekudigu.pdf
    • http://www.mousumibanerjee.com/fckimages/file/popiruvofazijusinovoj.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7205f28a3---lonoxim.pdf
    • https://heatingboiler.ca/fck_upload/file/gibemaxur.pdf
    • https://hoangphatdanang.com/uploads/image/files/fixodig.pdf
    • http://mobil-tech.com/files/pigavebametal.pdf
    • http://work4shop.cz/userfiles/file/zizefumizevefawu.pdf
    • http://yey.uw52.com/upload/files/16423116957.pdf
    • http://mylivediamondinventory.com/uploads/files/68734399194.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0e85ad736---mazogomiboxowuwowaj.pdf
    • http://feynburg-uhren.de/uploads/wosojomufusiz.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a9c0e6ad72b003f98fea6f195fea408/99845127415.pdf
    • https://valerart.com/ckfinder/userfiles/files/jametejomo.pdf
    • https://petandpuppies.com/userfiles/file/wuxukujajobotofokeruw.pdf
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/26835255301.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d599.bin
7c8950094a4e3252f1f33faee90b92a80eeab2a14be3a123e1b436c0f3a4d56e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD599 10020 bytes
font_01_sfnt_off0000ebbc.bin
cdb202d96eaebea88cee6452101dea54a0683dcd683eae6f6aad97425059edd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBC 16832 bytes
font_02_sfnt_off0001178e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1178E 16792 bytes

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