Malicious PDF — malware analysis report

Static analysis result for SHA-256 917bf1b3ef35a16d…

MALICIOUS

PDF

81.2 KB Created: 2021-09-23 08:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 03fad080a809937ff6e67f0e7c5f0add SHA-1: 0aec8c5d4155b543fb0ac54c2d1a9f0a22ca768f SHA-256: 917bf1b3ef35a16df566e19c945ece770ebe495c52bf6fbe873a6aa421d54e99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://tcihk.com/userfiles/fejofigamoxere.pdf In PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/jesukomaxelozize.pdfIn PDF document text
    • https://10fci.org/userfiles/file/xowitopitivizuxum.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137819ac6a8d---xawagudotivaxurazotuvivox.pdfIn PDF document text
    • http://safetruck.gr/images/file/13627769694.pdfIn PDF document text
    • http://bastola.org/userfiles/file/73917571000.pdfIn PDF document text
    • http://fabtur.ru/upload/files/39816480799.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/modiloneteni.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/jaganofa.pdfIn PDF document text
    • http://pilatesmystyle.com/userfiles/files/fazifin.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210921035559.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143cfe9cc33c---79913740390.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/wukilabibapagojizam.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/4764147442.pdfIn PDF document text
    • http://advertisingreports.info/assets/ckfinder/core/connector/php/uploads/files/mobakoxodegogo.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/62811058857.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/xatizagibeganiveg.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/nepovavetijipusitonatuna.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f91495a03c---xuxadivegipowemekonuba.pdfIn PDF document text
    • https://heyratacademy.ir/file/68483131979.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/21372746674.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/xigugunaxemevuruje.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614342d489c54---kewemugagudijos.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/33287384612.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/d7e1a28d994e6d7ee06329940291120d/wuziwerefamokasut.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/livixox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+remove+chat+heads+active+notificationPDF 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_off0000d925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD925 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13C 10840 bytes
SHA-256: 6fba5d0162cea91c5396e6ab0de33d326e44628c877167b2609120d5f19aef5e
font_02_sfnt_off00010a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1F 17456 bytes
SHA-256: 303c5c4c77b1902ab06d9c9465a7e6a0213375ff3e5fe46c7e9beeb434dc884c

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