Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f163aa1d77aa46e…

MALICIOUS

PDF

85.0 KB Created: 2021-09-02 14:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7dd1ff024e6ec7d63fb91ad2ebb4881c SHA-1: 255db7651de68827c15404533249b486f147bb99 SHA-256: 6f163aa1d77aa46ef17fa847243a59668567f058e7a11cdc40a9947c064455cd
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nail-free.com/ckfinder/userfiles/files/31981320183.pdf In PDF document text
    • http://tgtech-auto.com/userfiles/file/67434656790.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/bamiganogur.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/desifetulinonome.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/88244530866.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611957994d14c---vupabiworusubifarapeper.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/zosojatenixube.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/rurogovun.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/xogedepixixur.pdfIn PDF document text
    • http://e-district.org/userfiles/file/93018146683.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/89040285839.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6f020fc28---43539540964.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/giwote.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/rijunipuwatoraketu.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210722193157.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/45477426339.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/13347714499.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/11030829803.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160802c8165f24---43338627659.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095f7168a17f---melokikisa.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/8476828771.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/33922e7595e95abc0fda53379673372e/446348309.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/08c7ff63a233afdb092d51af0024111e/witalegenepamubux.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/10374330329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=christian+religious+studies+textbook+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_off0000e3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE3 11240 bytes
SHA-256: 5684b0e48499d89d3f3b5ab5c2997639300679d8d6dad9f3eebff877921022c6
font_02_sfnt_off000115c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C7 19012 bytes
SHA-256: 2ab135efa7586e840461fabb511f890d8c8fd5fb8946d99bc72b34e1a829720f

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