Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c3c348aa6930dca…

MALICIOUS

PDF

89.5 KB Created: 2021-08-24 12:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 86ae68040254c557917baf20ec68455e SHA-1: b6ab9ce32ed6dc119ade23c9f5e53fb47ec81b11 SHA-256: 2c3c348aa6930dca79c3d76c67635d63a3c5b045d149f45b23451bd059c8fd3b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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
  • 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 http://druckmaschinenservice.com/uploads/fce/files/79392444305.pdf In PDF document text
    • http://soflocops.com/clients/67403/File/zutilakomekugiwubone.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/32367328519.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e618296b5a---62902799257.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/37468660896.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dce1dd965---92724560883.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/tulozonevopiwasup.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/78n9ad6r54s289aabhai4bnt6e/nisix.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/f31b77855328c2c8663c9f555cdc8067/virunefozajivul.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/34095904283.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87435160633.pdfIn PDF document text
    • https://marigabung.com/contents//files/mutamujagitafejum.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/dokavebivevuniroketemiwo.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/dapejaporavidikoronagag.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/30192910ff2348b08c6b36d84ccadcd5/84495780674.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210624224408172.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/b0e5b97fba367d4d058cd81aad10d88e/69643584967.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/50956735334.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/belufatuxapobe.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/16739597366.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae70cca6c68---kepivulogaro.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610d845d3bc2f---23841988608.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/ib0ei49ra8edjolvkensujdiud/54404029032.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/gujowizoka.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/38a1e603de637e8744a4223614f2c141/tedojusifaburubiwudogek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=operating+system+design+the+xinu+approach+pdfPDF link annotation
    • 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://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_off0000fd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD41 17164 bytes
SHA-256: 04e1e2261f389ca5ac0f07aebefb9d7e19b956709145699c51451dbd0406a3a1
font_01_sfnt_off000129ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129ED 11360 bytes
SHA-256: 70418720a218a78d95e48685dee75ddefb63bb10b45f31188e0d627e4c69719d
font_02_sfnt_off00014461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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