Malicious PDF — malware analysis report

Static analysis result for SHA-256 412d42bbd57b7c89…

MALICIOUS

PDF

109.6 KB Created: 2021-09-02 23:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8781e760d22b6de620c94b17855c413d SHA-1: 3d2bfba29228cf406932c89765118cb25d015a9d SHA-256: 412d42bbd57b7c89f893dfe7dba8ac9d40550ee369053de1181ccabc18ab9dde
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure itself does not contain readable content, but the presence of external links and the high confidence detection scores strongly point towards a malicious document.

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://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160df2d8ee3edb---koremesuduzipobu.pdf In PDF document text
    • https://wonwon.taipei/photo/file/39539923364.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/vevuvemafefagavujikokoju.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1ce79b2d4---4842638793.pdfIn PDF document text
    • http://htwy.com/upload/file/jiruf.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/67169425042.pdfIn PDF document text
    • http://salespate.com/userfiles/file/poranuporosozivusifur.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1b428f4d2---bumesoson.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/tutefigoberuliramiz.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/3cc540b7e0118bff1718fc5d4c08112d/28782123466.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/85443068968.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/merepobosakep.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/23204175579.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/22929745557.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/92441571909.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a44eacdee58---49796710084.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/48927092295.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/renapolojasotibufifuv.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16120ed3763204---fuwoleduzafimunagoxukunun.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/72858953696.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/bazomixot.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85680518069.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/javaz.pdfIn PDF document text
    • http://caf-ljubljana.si/docs/lapaxezuwijiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=el+neoliberalismo+en+mexico+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_off000141ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141EA 21156 bytes
SHA-256: 7f668b018688306da3f10c22d2a97e170a2580f7810ce88dff7a8f482d2dc676
font_01_sfnt_off000177fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19013 10908 bytes
SHA-256: f2e8e949d8de424ff8a9cb3ad0ce78662c54d7966503f9e1942bef179c31a79e

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