Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f60f9b0997bf149…

MALICIOUS

PDF

83.8 KB Created: 2021-10-05 04:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 85a4ad4213c772dcdbfdb39ee7e43091 SHA-1: e5f9646574e60bd952d225dcefac2ab1b0f5a273 SHA-256: 8f60f9b0997bf149efcd088bc45c2612e1db40ee11584554eade583d7d80f7ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be link farms or compromised upload storage, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=diagnosis+of+rickettsial+diseases PDF link annotation
    • http://adance0112.com/upfile/editor/file/xozodorexexenozojuwav.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/2560249524.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/befupatimopamipoxerife.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/zexuxuzopanukowi.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/56521855299.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/691e6dfa19ec94b434beeb75ad87ec99/kolotutugomowerinawuvalo.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/juwoxi.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/torinifijarudufudo.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/tumapiwajiwonikirasotikig.pdfIn PDF document text
    • https://ripedesign.com/app/webroot/files/fckeditor/file/2973475326.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/50283305481.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rirogojiwagogufefasinom.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/24882592726.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/67032466890.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/lilowerigij.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161494db9e89c0---33130377222.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614fb07762168---38044485163.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/siditopubatesinigodadi.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/vewutidunozu.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/27816807156.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091404243773499.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/86016941307.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/32658932134.pdfIn PDF document text
    • 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_off0000e464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE464 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7B 10744 bytes
SHA-256: aff98918af6f5614608884035356451549bf4ec5b99040146eda7ef08bf08fd5
font_02_sfnt_off00011519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11519 17668 bytes
SHA-256: 22e8664dba0d628d0dd3ce9b74fe54f11f65b8a2a4b40b0d5553b0a6dfe4eb1f

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