Malicious PDF — malware analysis report

Static analysis result for SHA-256 c088177eb67b337f…

MALICIOUS

PDF

92.0 KB Created: 2021-07-03 11:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 124b9349bb109848e6ce21477647d367 SHA-1: 8780b07ef81a3e88a1d55a984e30aded449f309d SHA-256: c088177eb67b337f950ac8e622ce554fffdaa6f5fae35ea94ea7576848034545
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document's structure and embedded URLs suggest it's designed to lure users to external sites, potentially exploiting vulnerabilities or tricking them into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://aftaplan.com/works/peepsparty/html/upload_files/file/gubokewigunoxigekejud.pdf
    • http://jar-ted.pl/file/zarofejusawif.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/1dcd229aeced79060d1cf870ddde7728/nagetekuge.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/482a84bd8fe918898cf9f8dad0a63324/42527423616.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5725d1c98c---53856460673.pdf
    • http://brenna-ski.pl/userfiles/file/80016220375.pdf
    • https://acgroupenterprise.com/userfiles/file/zefirakinekaliso.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/7e13cf2e79e58f8233c163bf35c756d8/9880575528.pdf
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/zolelebokakegidebuf.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdf9c82f92---bodumiwidepemu.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/k6l9i62kv14sjn5o58tfmbv8j0/kinarafonigarasefoxoxik.pdf
    • http://bbfrontedelmare.com/userfiles/files/jedemavavotavopumazixob.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/ed1qn3cms1qg9innrvfgs5p563/28968896338.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d49879a41---48090758229.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7a21b8cef---rizada.pdf
    • https://baxsporthorses.nl/userfiles/file/kejarotamadokubogutugo.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44d9352e02---35371559603.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dd8339c35---7513567466.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/87ef49265d252d6703e9ea80d60d3a23/muzajibisajotujanik.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b89c84441f8---90812839128.pdf
    • https://hizlipin.com/calisma2/files/uploads/bikenemofaguxikegoveref.pdf
    • http://autohondl.cz/userfiles/file/75325358365.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a23595c9b9---4349442269.pdf
    • http://patronusalapitvany.hu/public_html/upload/65435678127.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/4770e91d106f04b113ba2fe496facdb5/jiritikoxevupopibi.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/00927a5b15015c106f9d63c11f663515/fasedetufeja.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=tbc+leveling+guide+horde
    • 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_off000106f5.bin
144ccc62d0a894827b34d006f8f4b31c6cda1eb53de685ff7e3025c3145a8810
pdf-font-stream PDF embedded font (sfnt) at offset 0x106F5 16884 bytes
font_01_sfnt_off0001331d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1331D 16792 bytes
font_02_sfnt_off00014b34.bin
c051205bcf193a98fbfc533b67df97c28175fd1255e89af44460b17e50077ba0
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B34 10492 bytes