Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b69a9fa852b4291…

MALICIOUS

PDF

79.9 KB Created: 2021-09-16 16:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1ff7ca376e2af9e8edcfc90ed973f579 SHA-1: 7c6a40fd8d84dd1d78e5c6fb15dc7cdab95872ef SHA-256: 6b69a9fa852b4291d1142ff4c96a7bc34af46f923b145149ad35c833db3755bd
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be redirecting users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://iieng.org/editor/ckfinder/userfiles/files/zonojenegonene.pdf In PDF document text
    • https://detmers-kontejner.hr/files/relunopikosatirazapiloxu.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/rizovituzivepopuwimeg.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/573c49dc54dcf67ce7ba2727dc4b1686/jomenebixajubixepetaza.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/99131755195.pdfIn PDF document text
    • http://www.grifin.sk/files/33465859349.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/12623701074.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/8115991880.pdfIn PDF document text
    • http://synphabase.ch/upload/file/24633844942.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/dufenowirubuvoseruruluf.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16137bd06c4db4---dojupapibezaw.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/xowixavabadobalalalawe.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/30311057098.pdfIn PDF document text
    • https://oasis-travel.ro/files/fexurexewumiwumana.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/28853470488.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364afb1faf3---muramerunebijo.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd3e3adb21---xajivifolukakutixu.pdfIn PDF document text
    • http://bienbao.org/uploads/files/kenirisanujijuvefaburen.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/54981220714.pdfIn PDF document text
    • https://umartravel.com/files/fejonubogobitomuronuxege.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/rofubekunixuviwapeguraw.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/pozosizexebadoputilo.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/52306462771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=big+big+baller+mod+apkPDF 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_off0000d5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FA 10648 bytes
SHA-256: b9abe9defdf4e2a5e94c162eda8c3a6b03c7732d8374dcf786ae5fef22f0cab3
font_01_sfnt_off0000ede7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 17112 bytes
SHA-256: 5ef358a00e7444dfdfe1f278443a3f7456477b601d48cbbd313b3f8198454c91
font_02_sfnt_off000119e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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