Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec9173d072fa17fc…

MALICIOUS

PDF

86.0 KB Created: 2021-07-08 18:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ad1c9cee2ee94cb12c6e9dee08a45ee SHA-1: e22659e69fd55e02078ca429ae5823deb4770397 SHA-256: ec9173d072fa17fc5cbcff6a7f5b7267c29cd34794c4feb7ef10fbf61f51cb13
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress sites, suggesting it's used to distribute malicious content or conduct phishing. The document body is unreadable, but the heuristics indicate a focus on external URI redirection and link farming, likely to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://krisoc.ru/uplcv?utm_term=www+yahoo+answers+com+questions
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/ab1ae68b89a681771b1c406fb0bc12d4/xatalek.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160afd7566dee2---45989313592.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e34c81de8---56638472145.pdf
    • http://autobedrijvenindex.nl/images/uploads/21976925284.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ec9c0589b---tamegokezafipake.pdf
    • http://crmrealty360degree.in/userfiles/file/jugazawogimunuwominuv.pdf
    • http://musorcentrum.hu/files/article/file/47682599238.pdf
    • http://jedwines.com/cmsCart//upload/file/95186571885.pdf
    • http://yucehukuk.com/resimler/files/30845387420.pdf
    • https://godahoian.com/app/webroot/upload/files/nimixifiped.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/067a31a3289462bf74fb0733f93f7d37/88025900266.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/arg24pq9v9pai5dmvrgk1jncos/tafokidijajeber.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/cebb27f6ef360916cc64f9a5fc9d7ed3/tunefinulolofofixerub.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fb851852e---megewijuwosi.pdf
    • https://vansuloi.com/uploads/userfiles/file/47211208446.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1541e6070---duxolafenopupuvale.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ae8646e25---xoxetunanunekulesefiza.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/df73180f25cdb00c9dd19e106d82e3c3/lodujikijejilemuf.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160add365746b2---80422738696.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/13b93dcb95f4049304e83cd198ef344f/71230328579.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6apshpj8qh3dlbd8j6khm64j45/25959403478.pdf
    • https://thediamangroup.com/_images/files/54910350944.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/e4fca5acf0dd637f15f491517ecf4786/tegapabakatefijivuniva.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_off0000ec36.bin
613b091f5cb39610968a83762c43dd05348826f6d6cda26665a909a16b09edf7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC36 17324 bytes
font_01_sfnt_off000119a7.bin
9556faba9faca77b4d7343b75305cac3ec27aed75d1e5edb6b6b9cae5ac5c753
pdf-font-stream PDF embedded font (sfnt) at offset 0x119A7 10888 bytes
font_02_sfnt_off000132c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132C5 16792 bytes