Malicious PDF — malware analysis report

Static analysis result for SHA-256 239f672d7935a7fb…

MALICIOUS

PDF

90.3 KB Created: 2021-09-02 06:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 18167b538efa426930c4f23b9c8f6e5b SHA-1: b427bff02f2594bb902df47a3862cdc284a290ce SHA-256: 239f672d7935a7fb09de9f7e2cf34eed3208e6634a1498d37270409a840a7459
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and a machine learning classifier. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a fake browser extension or update, a common social engineering tactic. The presence of numerous external URLs, many pointing to compromised CMS upload directories, suggests a phishing or malware distribution campaign. No scripts were extracted, but the overall structure and heuristics point to a phishing lure designed to lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://infrive.ru/uplcv?utm_term=modified+k+means+clustering+algorithm PDF link annotation
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/5eba4c5ca8ef22b83b392055c359c238/vopufoleja.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/luwumipojeterip.pdfIn PDF document text
    • http://dogninja.com/userfiles/files/zenudanixevidujob.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/76264904283.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/92852333692.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/538c69123b5b83783e1a30e5ae2afe60/14062304611.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c279bf351ce---66774982095.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/gisifo.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/68232500f5a6a883beea9fad0d119314/45424503711.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/gidobewesikamuveritoz.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ggkqac7ud78vfhg8je4nufngj6/bajufuparajopedafanipule.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9a8246381---60983098077.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608572b371531---gukaru.pdfIn PDF document text
    • http://greenbrier101.com/userimages/revewato.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/rafowatefobuk.pdfIn PDF document text
    • http://kleiberit.ru/files/file/45332788620.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097120b8383a---89797448429.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/razetagikerazejiroguxi.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/89635044073.pdfIn PDF document text
    • https://bio86.net/fichiers/vosifoxokizo.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/33828088139.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/37898304802.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/15046805963.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/murav.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_off0000f749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF749 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5B 19324 bytes
SHA-256: 64581e293d443d1426b349b2c41a2c0623e7a6a403caeda3a4a56b0e320cd383
font_02_sfnt_off0001419b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1419B 11108 bytes
SHA-256: a600f7e5260f2e627a0e9cabecee9218f62689309ca1a68f84050e5afd0262fd

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