Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d100f88bdaf00e9…

MALICIOUS

PDF

77.8 KB Created: 2021-07-18 23:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f27c5f4bdb78c1bbed9211153be318a SHA-1: bd013b9b65f9918b109f234718e6ae4d67bd5ecd SHA-256: 2d100f88bdaf00e977c0d63239fcffc39c133cccd9d9350408e1e15a511dd221
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of many external links points to a spearphishing attachment as the likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cargotavio.ru/files/file/66483909934.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/dnpmiqdhnifbkkqcui9aa4vb11/sovibakezewipisojikugix.pdf
    • http://onnetsolution.in/userfiles/file/50737535251.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/sk2qa77h15ff00qjnk0js84p17/kidiwokezuramaxiv.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/154ddd9cb327bde15b93d907072571e2/soxadafenaz.pdf
    • http://lawrence-spruill.com/clients/42275/File/24899638797.pdf
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/70737760588.pdf
    • http://sacoorhealth.pt/site/upload/file/guvugol.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7bc254da5---64389963879.pdf
    • https://agrilaui.com/userfiles/file/nomujireredu.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/03128a45fd8aa2ef401e5fb89db36b33/juruvigowomebuxuzokodanes.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813068667f8---12844463587.pdf
    • http://wallsfamilyreunion.com/clients/876683/File/wuwitibizapejamoxetividib.pdf
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/zetuzelaxajikofuvato.pdf
    • http://e-hematologica.pl/users//file/kusis.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608218e569a60---29759665920.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b77f387ad7d---lalegurafozo.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/58e25b18cb8c2c031ec7c1285a8a2b41/70208100540.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0e90cb26---72876683258.pdf
    • https://at2-turbo-j3t.com/contents//files/pemepodujel.pdf
    • https://santchavarabed.in/ckfinder/userfiles/files/wulel.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a57b8dec880---vavigipudamefudisa.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/1344e95bfe502a61ef0116bc20c434de/jobujokefotawepo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=unable+to+edit+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_off0000ccd1.bin
795d337feac15c8df83de03c6d21c2329b4e5eb743e3f1eefc3fb18651ec3e4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD1 10372 bytes
font_01_sfnt_off0000e41c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE41C 16792 bytes
font_02_sfnt_off0000fc2e.bin
3da5685a8b3b6bedf70da981703c70444f81d5994427100893b96efd24886096
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2E 17632 bytes