Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c17981fc71cc186…

MALICIOUS

PDF

84.4 KB Created: 2021-09-01 00:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: afa118639af86c1d15857da00fb350ef SHA-1: 8350de891415a6b1ca834982a4d43bd68b02f3f5 SHA-256: 6c17981fc71cc186465b5cd5fd4769c0756dd1624eec1adf9b20cc9ea20d462e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution.

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://nomylo.ru/uplcv?utm_term=in+accordance+with+meaning
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/89403757cde182f9853539d2617484a1/51778583073.pdf
    • http://cocoal.com/uploads/file/bifikabowekakodowavug.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdf26e3d53f---kolokulozirixukirab.pdf
    • https://bwawarszawa.pl/upload/file/62022890934.pdf
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/wolubipesimudaro.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a792b807508---4918376601.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/933deb73649ad445fd856fd5f1fa99db/numidatopuz.pdf
    • http://jeansresource.com/js/ckfinder/userfiles/files/63737345979.pdf
    • http://xaydungphongphu.com/uploads/files/80907411228.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f64d2ba148---21828577290.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/4o9elvclrjk10e0ledrviugc9g/xulumixajudi.pdf
    • https://aawyx.com/sites/default/imageuser/file/zonogamatodokojuten.pdf
    • https://nestsearch.in/admin/uploads/file/pupodofe.pdf
    • https://aedwea.com/upload/foto/44560261189.pdf
    • http://leadershipcareer.kr/fckeditor/_upload/file/gugesogubowodape.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f00725540---24722169986.pdf
    • http://print-printonline.com/ckfinder/userfiles/files/76110994598.pdf
    • https://exlite.it/ckfinder/userfiles/files/90126186616.pdf
    • https://fotojursa.cz/userfiles/file/zolejomapovolubir.pdf
    • https://petek.biz/resimler/files/vegofejededoniw.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1785701840610e2ba803fff.pdf
    • http://dinobajka.pl/Upload/file/kakiverupanaturojuno.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b392ad025e---19600025657.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/5aa795513c7db38e1ded655c96a0849f/54210038160.pdf
    • 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_off0000dbd3.bin
c44bc7f7655a2528c6e57073abe4d18650e9e822b030aa223d58c5fafbfba6bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD3 21420 bytes
font_01_sfnt_off000113a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113A3 16792 bytes
font_02_sfnt_off00012bba.bin
a4fb8addbf5fb48fcd1829b33853b57f9c9a4e7ff762b758b064255dc730140a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBA 10640 bytes