Malicious PDF — malware analysis report

Static analysis result for SHA-256 92bca7b6f96f2cb9…

MALICIOUS

PDF

93.0 KB Created: 2021-07-14 10:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2e55c4b907fba84a635618e1e9af964 SHA-1: 655f5155ade0709d11cc75f6678479bad91cdcc9 SHA-256: 92bca7b6f96f2cb98a241f1b4c0bed260175575e85431c2a515305b03d046e26
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple websites, many of which appear to be compromised WordPress installations. The primary purpose seems to be redirecting users to potentially malicious content or for SEO manipulation, rather than direct exploitation within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608084946ab7b---bilupexozox.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8e02918d2---6533689274.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/v892aj4n6698gqnik4jhop0b02/merixonefino.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/c8abb09013f19760832ea26a18d786cb/77868596757.pdf
    • http://morard-mcf.fr/data/Files/94383007381.pdf
    • http://impex-italia.it/userfiles/files/70509947580.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1881f776f7---nudeliwunonenolopavu.pdf
    • https://cambodiadriverservice.com/userfiles/file/97568387788.pdf
    • http://onmamtour.com/FileData/ckfinder/files/20210702_2FB9F9574A4CB0FF.pdf
    • http://galantemontagnana.it/ckfinder/userfiles/files/22479632211.pdf
    • https://icbacademy.com/upload/files/duworaw.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/08708ca3673c979d0f9e91acdc276817/60570199513.pdf
    • http://sinhorelli.com/userfiles/file/liwer.pdf
    • https://kuraniterbiye.com/resimler/files/35109963051.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/361f772a7adf6950d2cc599c39c9042c/34088466793.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/h9agg39p7llvvjjlmq5aegb275/pokon.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cc013fa8e---newijemotatetuxukipugubap.pdf
    • http://say-international.eu/userfiles/file/pegidix.pdf
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/xikuwalugokirilit.pdf
    • https://sailstudy.in/ckfinder/userfiles/files/topilapulakigipesokal.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aadb1a3289c---50155622133.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0b456a478---bepupizozatisojumobomumi.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/sm5tm9tif84ar2l1me70v8ur4q/ziturulonalotulilagamisu.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746b823f775---kepivatojoziwo.pdf
    • http://xedaptap.net/userfiles/file/nedib.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608675ffc6622---fanafafomuzig.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+pronounce+would
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef8c.bin
7ac375ee3f87dabf5a8aab9ef66de401914e669ce569ae72251ce3f3871ecaaa
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8C 16100 bytes
font_01_sfnt_off000104dc.bin
3dc5905807e71422d53a0dced81c92732c7ce10aa9096f134e19ac68992245f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104DC 10264 bytes
font_02_sfnt_off00011c11.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C11 16792 bytes
font_03_sfnt_off00013423.bin
1d2e04e8e09423cc03d73122ab909d00e3ba76f3dcfafdfedfab6f442b313f84
pdf-font-stream PDF embedded font (sfnt) at offset 0x13423 18588 bytes