Malicious PDF — malware analysis report

Static analysis result for SHA-256 a460853d60680891…

MALICIOUS

PDF

83.5 KB Created: 2021-09-11 18:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2098a8d860b1ed13e45cf113e6836146 SHA-1: 215af49a6ac5e3f8ec49fde5b657afebfc03c4e5 SHA-256: a460853d6068089185eed8cddc79454949f2bd7f8a4ad2d081261e89d33fe358
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://irlanc.ru/uplcv?utm_term=decision+support+system+software+example PDF link annotation
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613205e2722c0---kobabinibepefonimef.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161332ce6c26fc---sisagoboge.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/bumaxugotituxe.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/wugivoforoverog.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/wewabida.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/bikemusedebafajabogepofi.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/jodanexuta.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613365237516f---98335812657.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/90130688437.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/0c898c8c608537943c80ae4ef4534e6a/77633797448.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/23652566408.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/45434924480.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/80447496933.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/ratukurojijugoni.pdfIn PDF document text
    • https://maria-galland.ru/files/file/97459499965.pdfIn PDF document text
    • https://negaratoto.com/contents/files/gopezidejogofasana.pdfIn PDF document text
    • http://shamayachts.com/upload/file/81075420369.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/8bv12ov9d61kes9toj81ib9um3/87344094566.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/69457524569.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210909162756746467692.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-8/20210908113656830775.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109060857397710.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/lejigek.pdfIn PDF document text
    • http://sinners-party.de/media/file/suwozevotojodawofevi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE103 11044 bytes
SHA-256: e61fdacb599eab8a185f5e03bc960ec06eb95e704428587d76945ae614571f65
font_01_sfnt_off0000fad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD5 17864 bytes
SHA-256: c100804f3bdfe7c381e3baeba8fb8f67d2420c3a4c13a7c0fa8e7e60cef86563
font_02_sfnt_off00012877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12877 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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