Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e19e1b2c89f487…

MALICIOUS

PDF

111.0 KB Created: 2021-07-15 09:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0b0493d4d309f81177c6673ae314c563 SHA-1: 0c2fa6bcaf1e8da075f423af88eb65e2e2e0402a SHA-256: 86e19e1b2c89f48792ab6530ba3024fe93e6f70d73ede4908ad87f31bc111912
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads, suggesting it functions as a link farm. The presence of these links, particularly those on disposable hosting, strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2dd74c4bc5---mopixirinageroxo.pdf In PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebe74ae898---labozuvir.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a6a3775bd---46182914130.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/a22a29b331bddbfe3a84fd77a9ef98df/75862520404.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c628bdd4e6---givojix.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/880bc7ab08ae0e09ffb352a06814d2be/didimuj.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/15120741446.pdfIn PDF document text
    • http://juha.be/_files/file/90657800075.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/buronireginidivutedetu.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa6dcec03b---vadajisadigidakerololebi.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/797a7f9451f3fff4b739710d7910f49c/93604083714.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/7fe1a4da82f4830ae389ac867e7bee55/taxifi.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e62f86ec20d---22659410494.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/be0a6c8a1d356bb36fc44dbad593f0cb/7444492253.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/66567048311.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/20828678934.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/padagoxijikumube.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/5d6c241f0681b158cb08a5cab894ceec/5586713975.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/kidazezive.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/1736a8d80adfb71ec7ee4e631ab67a44/56770329835.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/wubodasinidebuganonenizut.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/6945609390.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/61570d5191791c4922ada43ea85d2d66/66285881437.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/b1f588a2945b6934bbf4b3b4b1fed0d4/39633675093.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/16740592233.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/jifokun.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/5671471038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=87+kg+in+stone+and+lbsPDF link annotation
    • 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_off00014ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA0 10716 bytes
SHA-256: f8b72eb6a51c12af7f9b8c2a218697faf1de42a25a1b6a9b323fbe5e3257d5e7
font_01_sfnt_off00016730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16730 19592 bytes
SHA-256: ca0f4b5c8769c426ae91b75f27d070f445c9988a568afc0f9c2b96c9db24d196
font_02_sfnt_off00019518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1