Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f8d6db72494dc5…

MALICIOUS

PDF

82.4 KB Created: 2021-09-15 21:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5690b6a7d596194f6255790de42b1de3 SHA-1: 1bb8ef4db0d406edd5cbfa42159e677296b879dd SHA-256: 17f8d6db72494dc510edbdfc62501bd25ec087edbf7d3fb4bda427913c8fa20a
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a large number of links pointing to compromised WordPress sites and disposable domains. The links are designed to lure users into downloading further malicious content, likely a second-stage payload, under the guise of a free software download. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=free+ms+word+for+android PDF link annotation
    • http://exms.fr/sites/default/files/file/69059235771.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/0ec002d93966338f4df8ec6d80dce74f/turukofu.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/34399879172.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399c1b8ed62---relipokikokekosasewijab.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/wuvemunakovogi.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/46555917497.pdfIn PDF document text
    • http://ing-ka.com/user_img/file/13224384818.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/95342159768.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/2077194084.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/50825925687.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/17573878514.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/kuxitepobevafin.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161386ec194c6d---rixuxemejezoluxoponunem.pdfIn PDF document text
    • http://xhzhengli.com/upload/35395702634.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/62894520987.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/lokilosewapimifomodilino.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/vulopusesi.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/40241907482.pdfIn PDF document text
    • http://fxlcd.com/upload/file/51750851371.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a89479e20f---54563864146.pdfIn PDF document text
    • http://epmachine.ru/d/files/69072089357.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/butivorusenexoranolej.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/23176058756.pdfIn PDF document text
    • http://csigikes.hu/admin/fck_upload/file/guzakumasematajonesuda.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_off0000dc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF462 10436 bytes
SHA-256: 444812fc55bfa3870d2f2bd499c9be8183c4f07025223197a731140293732927
font_02_sfnt_off00010c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0D 18720 bytes
SHA-256: 5c8d7a95452a577d749c11fd130d371c464f9f6f3ce6cd3bc3634e1413a3a600

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