Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb4c86cab7cdfa9…

MALICIOUS

PDF

89.5 KB Created: 2021-06-27 09:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7af3567be0fbfb701b353a4d71149065 SHA-1: 811335d8d189216dfae301f44ecb8c27f70d2600 SHA-256: 5bb4c86cab7cdfa906f5e3faf8a5b113afaab8c94a97d5fac4afc3e5e1e9c5cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, exploiting the user's trust in PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/dfb226f6dce21c014367ac74ebda13d2/21067393650.pdf In PDF document text
    • http://robwalker.net/fckupload/file/54420240708.pdfIn PDF document text
    • http://zuche0551.com/upload/file/54698996582.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/b1e17156306fce9da290e8a0fc62282c/49741625356.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5638979b4812e9fc281477ed9da30d13/63385384043.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/futesuxobuxumitati.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/62fdfbe40d52ac843c6628756a878c2d/68046929620.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/4998347467.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/79697865257.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b777e41488d---tugazozaniduramowetub.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cbee251978f---97095590387.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/kidekuxokarofefa.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/f6aju4hk199uv1gsuf4q7b1jj7/25450960877.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609839b7a0e07---bipibikox.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/fg2mk3uatblk3pp6ftlahtmcv7/15987850251.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8fd64d7b4c7726a4cbd7abf3cec2357/bizuselizumobita.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c853d6cb18d---juranafowu.pdfIn PDF document text
    • http://kelvista.lt/images/files/28190117848.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/zufajosowox.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/ae161ec3397642883c88022c4ef5799f/fugugobowazabex.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/zevurariniwubonam.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/62152333850.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/33888524303.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/76985230752.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/3011812287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=german+in+10+minutes+a+day+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_off0000f87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87E 17364 bytes
SHA-256: 05247e89726308e3ab521ee72d8071bad06a042072ce9edad37cd28a7dd551f8
font_01_sfnt_off0001259b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259B 10920 bytes
SHA-256: b0e63b6c788082330a7950a53a6e6584b3324e06b53ea0236192ca1f2c9731bb
font_02_sfnt_off00013eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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