Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a08af2dba81497f…

MALICIOUS

PDF

78.3 KB Created: 2021-08-29 14:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a3e73c6a2e45060e38cadbf1df578573 SHA-1: fd85f37cf94e7022973149e87694df37504753c6 SHA-256: 3a08af2dba81497f03d67e8a4e14b9c008328b75b443f1db57ab50d66451c849
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, hosting numerous URLs that point to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious sites. The presence of multiple unknown reputation URLs suggests a distribution or phishing campaign.

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 http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607122323fffe---fuzegurutadenowoli.pdf In PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b011093e122---99638211634.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/29642406651.pdfIn PDF document text
    • http://rayanchem.com/d/files/67675867930.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/9bfb713eacd379e1642036b6d7a3daf5/jadubemoname.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/96e634860803a2d19e63f588e22dc72b/newatifovimovesopil.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/f6666bebab7d34da7c657cfb7236dcf3/34923715197.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/mefivumavibobe.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/87a30q8ma15ellt54dobftq69t/jedavuzenoz.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d20cdce1274c2eee213567a589bbf820/41560035679.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/waxupugorebawiz.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/ec67d89f7de2108043f44743bfcff5fa/murokuxupukogolelovidax.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/gaguj.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/kewoxuwoxememebuzafar.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58d6db5538---287569085.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/mirajaguwikelezirizarow.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/wizulapoguxinadojuza.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/solebi.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/busetoxosuveguminunowid.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/2f1e28a745ca90a2df20f259755d2b48/suwujosuvigodidisesuza.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/69984787652.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/v1hqklj1eikh7a738cr419nd31/13183431983.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7b2428e32---pazeviseri.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160784a8a592f1---48939247267.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=along+with+synonymPDF 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_off0000d075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD075 10344 bytes
SHA-256: 7300c2b7551d8ed581a369a9c58e933789aff1469c07316eefe2814bbc5f15a9
font_01_sfnt_off0000e7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBD 17068 bytes
SHA-256: abaf38cbf8bc029f5623920f289b262a24ee11e5d938b0cb738f912dad8adda8

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