Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a841e981b494e40…

MALICIOUS

PDF

77.5 KB Created: 2021-08-18 20:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 501454054654814fe10d8486c3127435 SHA-1: 75110d68d43607218453e885cb7477252b4a4e4e SHA-256: 7a841e981b494e40cccceb36690234dcb82a1083a002248a02f9fed276ef0a2b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised websites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs suggest the document is designed to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://nomylo.ru/uplcv?utm_term=lfs+mod+t%C3%BCrkiye+honda+s2000
    • http://world-housing.jp/ckfinder/userfiles/files/8727088475.pdf
    • http://emilygrilltogo.com/uploads/files/58978757219.pdf
    • http://geometrarontani.it/userfiles/files/suponaxunibowadotub.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d255b41632---tosibala.pdf
    • http://ildungrice.com/fileupload/fckeditor/file/91151661145.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cb12c9f51---dojalagojedazipesan.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161026bc6647a3---58046941656.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e60163986---gedabekuxunamoxubiw.pdf
    • http://01host.ru/userfiles/files/tofogofuzajev.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/917a7e6a4070789acc2de17039985531/60674748252.pdf
    • http://utuin.net/files/fckeditor/file/95486217381.pdf
    • https://smsenerji.com/resimler/files/94092271965.pdf
    • https://bravo-hk.com/userfiles/file/lokazow.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/0me5o32f88vcroe2si8ljj0vrv/8119627327.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/f026e1de5c95e2672731ba22fde0a296/vikakofo.pdf
    • http://dejede.com/userfiles/file/52312596239.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/a1e21ad5de89dfa049b9dceb4184d12c/piwisemo.pdf
    • https://dianthusindustrial.com/resimler/files/6147082522.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0aa8c5035---60835700792.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/1f122c016458955866cb77b320cbdebf/21404720973.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3888eefb13b22af3ccce43fbd37f1731/xumepuzezorilopo.pdf
    • https://travelinnsuites.com/nbloom/fckuploads/file/nijesofutilalenuledim.pdf
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/rapipozi.pdf
    • http://giasuminhtam.com/Images_upload/files/1673315230.pdf
    • https://minlinart.com/archive/upload/files/18404411568.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcd721f0c55---zifufedabaxojolixukide.pdf
    • http://keacg.com/upload/files/60615380541.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_off0000c548.bin
e181a62b356c621d2632b53b12647731b8a19e98b693da6dc68e5f4ec3abd817
pdf-font-stream PDF embedded font (sfnt) at offset 0xC548 19744 bytes
font_01_sfnt_off0000f48c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 16792 bytes
font_02_sfnt_off00010ca3.bin
c3e417506dbc50301595aaf9c11e891237aa3405b6fc7589c0fe6895ff4173dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA3 11172 bytes