Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dcbb2b9471cec5e…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 08:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9f151fcbe461a95e6f745d7a3dcbb9c0 SHA-1: 25b7f7a1a2a0d2b4921e82a593875f22ed92ee5b SHA-256: 9dcbb2b9471cec5ef7da50b02d9b2359f2e9e7f83616f5e8a0eb65885c314eed
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It contains a link farm pointing to numerous unknown URLs hosted on potentially compromised WordPress sites and disposable hosting. The 'utm_term' parameter in one of the URLs suggests a phishing lure related to iPhone issues. No scripts were extracted, and the document body was unreadable binary data.

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://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16136a94ece87e---43742921806.pdf In PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137316002981---faxag.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/peweg.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/253924418.pdfIn PDF document text
    • https://avela.md/userfiles/file/30595730114.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/31298914385.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/tipiziwodowubana.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfa06d1160---17872956868.pdfIn PDF document text
    • http://metzlerranch.com/userimages/vemusuz.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/27057127736.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-1/20210901110259432120.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e8ce5f3e5---fufivimadanakowenobepuxil.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613112bf2c0f2---4472159540.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/38968786308.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/bsnpvdkna1aiatb7ft3pckj1n8/49405370468.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/96564337819.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/rasudaxudawov.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/93926995072.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/gepumakijalajijutaworu.pdfIn PDF document text
    • https://ibericadearmerias.com/file/kejurozusedodekedo.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pakavorur.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/65829479086.pdfIn PDF document text
    • https://lapakunited.com/contents/files/80252743061.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/20219465551343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=iphone+stuck+on+restorePDF 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_off0000daf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF2 17496 bytes
SHA-256: db8821f4ffcc84536e58bcab4096921bbbaf882aed43d488ccc17f8a454d5b7c
font_01_sfnt_off00010834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10834 10316 bytes
SHA-256: 6556a383005251e9f00e07c0334bee19bf1346673bdfcd2ee9384d52a36684bf
font_02_sfnt_off00011f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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