Malicious PDF — malware analysis report

Static analysis result for SHA-256 18af2210271e1197…

MALICIOUS

PDF

79.7 KB Created: 2021-09-01 14:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7911875a896898ea84ac26b919dafac3 SHA-1: e21930b07cc68a17726efa4b0ea19ac6693290fc SHA-256: 18af2210271e11971e719f8574b0deed63615e1403ff2da072656d34323cc2bd
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's flagging further support its malicious nature. The document's structure indicates it's designed to lure users into clicking external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5756

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://catamma.ru/uplcv?utm_term=element+of+form+in+literature
    • http://marthomaiticherukole.com/userfiles/file/gosixodobuzulidokemava.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dacd0377d---pavuroko.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16070d5ae84ec2---38274276736.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9bdd060ed---81643871591.pdf
    • http://huiking.cn/uploads/file/230553186812.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7b32d67c6---wudelesatuwon.pdf
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/lepufewulil.pdf
    • http://harryreichert.de/uploaded_pics/News/file/78837173528.pdf
    • https://esprimagroup.com/userfiles/file/lalejadobuk.pdf
    • https://netwindowvn.com/uploads/userfiles/file/96494075986.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084e75adfa03---36994055634.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/66557268259.pdf
    • http://choinka4x4.org/cms/files/file/47778314493.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161007a4d36ca2---wanefarepusilo.pdf
    • http://giustizianuova.it/userfiles/file/gudugabinojidewa.pdf
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/64124343970.pdf
    • https://jcmimoveis.com/userfiles/file/73170683908.pdf
    • https://technische-dokumentation-hoffmann.com/upload/files/14828661176.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/5dcf100a82dd2f57a6120b6995f33cb6/xovotodulesirudido.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb370b42e4f---vowimidabutojixiz.pdf
    • http://dermalab.pl/userfiles/file/32034401346.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f82406cb1---vemukimasazamuma.pdf
    • http://proxima-design.cz/files/file/90074831720.pdf
    • http://clair-environnement.eu/catalogue_dynamique/file/wegudugixezag.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/f81vmnn968eei40b04358dq9md/24982814583.pdf
    • http://xboxheerlen.nl/userfiles/file/vebokonolowigozezuvi.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ac1.bin
3f669cc2700931c11d017d1f61c50f0ff92dcc25089f82d4f65c5e0278a8d357		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC1 10292 bytes

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