Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9d2c4f2181e4cb…

MALICIOUS

PDF

129.5 KB Created: 2021-06-30 03:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cff0b9b4496fce84a8d543b33dccc51a SHA-1: bc3510e6149449863e76c2c408fcf9d1a0ee0718 SHA-256: 2b9d2c4f2181e4cbe54f1fb56673a197dded24aa5fac76736b04f99ab5159c9b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting domains. The document body is heavily obfuscated and unreadable, suggesting it's designed to obscure its malicious intent rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://brunsfamilyreunion.org/clients/e/e7/e70b0594429ddd28dfd4dd2f61c76e80/File/75306633161.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/2b8337c2f0725c7894471b83eaa38dc5/34461737880.pdf
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/69091536469.pdf
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/likozomaxeko.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/88c8a3ddfce5019a99a4deb5c656ffbb/7864035585.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c38d404d2a---nemafapufifibofexigodukiz.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/hof2nq36136rc6iasi8ilgpui4/20425048750.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/evq0f1hc4bkgqhjcvs94lgeo91/pirirazezakixiwenow.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4d28837d415663505d82245e6d4be935/67710332030.pdf
    • http://gift-founder.com/archive/upload/files/ledilirovif.pdf
    • https://seerupit.dk/assens/file/96294876109.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2726bc930---4169971775.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cd057a21a70---95861618672.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160794afcc2b14---96013642931.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/od4oo8s0o8dla87d1357562poo/nasorumeborofi.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e409913935---51269167811.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/f65e80f8cd95514de591921f69ed3bfe/segoxokitukixif.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/02e6415711af67e57c1d642935bc734e/lafijufibatotugusunos.pdf
    • http://amexeuro.com/an3_Uploads/file/vinenasenogevaxepukoro.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/21d32e64f23bd292b31a449a650d87b1/85690680380.pdf
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/30787097560.pdf
    • http://ruilong-ironwork.com/CKEdit/upload/files/37749235404.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adae12ae17---silezutabilugegelizaw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=icd+10+psychogenic+nonepileptic+seizures
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000198f7.bin
9f1ccd7c2f362ee3177bc81e7162bd1ca75524f5d7151fc288ef7776f79db3ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x198F7 11028 bytes
font_01_sfnt_off0001b273.bin
b31c48bd82285e59b34038335c823ef30be68f9222f410c16d27e92dd637bff6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B273 17728 bytes
font_02_sfnt_off0001e00a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E00A 16792 bytes

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