Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb4afd9fd82f394…

MALICIOUS

PDF

91.6 KB Created: 2021-09-02 06:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e52108fa9016012fcea1f4b3fe83f481 SHA-1: 468fcc1468a6bdfa068c9812b37359beede5cf99 SHA-256: abb4afd9fd82f39485473246dcf56a30de5dc2c2e80d27759f968316db682c0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to lure users. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of phishing or redirection campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f57a3e079---katamufisefujibosa.pdf
    • http://ksklinika.ru/ckfinder/userfiles/files/11361723838.pdf
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/ladodakak.pdf
    • http://kimyasaldubeller.com/upload/ckfinder/files/39224368990.pdf
    • http://bulmarconsult.com/files/vosigopugixir.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/77d13740c36c1be4c71c4e7dff5145b8/37959484764.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/i92h574do2un7r096fs4cvaf50/4352058951.pdf
    • http://dfh-consulting.com/userfiles/file/72576217956.pdf
    • http://chinoboxingclub.com/clients/36032/File/wokozokodebuwejegu.pdf
    • https://sklep-pinokio.pl/web/uploads/files/18133093327.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/51aeeea15acb82d4493ec9fb67a0a4d6/xareko.pdf
    • http://ccspatti.org/userfiles/file/6968943490.pdf
    • https://tortugafilms.ca/adminfiles/file/29606515067.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160843629267ec---gozozesegobejivuluvafufa.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/mgomjvvtevt58chp8qrkh04jme/71007534558.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160838f6d7dda1---titefur.pdf
    • http://ballmillfactory.com/d/files/pasinekuzepitol.pdf
    • http://okmarin.ru/userfiles/file/sabuwojag.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9028dcac7f---burisitafis.pdf
    • http://wine-paraphernalia.com/files/winep/_repo/file/jesovuj.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/8ddd1b8f0e31d0ba584403aeeb177f3d/74096222171.pdf
    • https://gcr.goldcrownresort.com/magazine_files/files/verewubewiwidoravemazuvux.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/94cfe4c0e1ef1b4403dbb31e2d0c023c/remudalifezudupalete.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf701930a1---pikukufejuxon.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/bbae616674a858c6b1b7e9c642995729/kilojokuxeb.pdf
    • http://alltechsro.cz/files/86793852053.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+get+first+star+in+mario+64
    • 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_off00010138.bin
09c37ebbf9962978d3144f194495511db3f549097993e80108ff4c3549decbc3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10138 10832 bytes
font_01_sfnt_off00011a53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A53 16792 bytes
font_02_sfnt_off00013265.bin
ca71106e22b998dd43e8db8f2b5418f554185d917aad3f887e29cd2049fd12a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x13265 17440 bytes