Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0240f77bf59c80…

MALICIOUS

PDF

86.9 KB Created: 2021-07-03 22:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ecfc5a32b5374a8bb53eb7fc24efb7ac SHA-1: f3a126864d3dea75d83319142a1dacb6c5a7425b SHA-256: 3b0240f77bf59c8049151493212329ec918e07a25288631d11deead3a715b04d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The presence of external URIs and link farm heuristics suggests an attempt to lead users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720c717dea8---63247517486.pdf
    • https://pet-fashion.ro/mm/file/juvozezubebuwib.pdf
    • http://dayuntang.com/assets/uploads/ckedit/files/20210702105713.pdf
    • http://ubest.ru/images/file/beragupurizuvirugupomikom.pdf
    • http://atreve.eu/ubezpiecz/obrazy/file/xixasolugupufekulafaselis.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c188931746---jikeros.pdf
    • http://446888.top/userfiles/file/gewibagowerogejujonejuz.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b3559ae8ce8---61205246500.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b55393b8a---55464116808.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/add72fb6ab8efa72113af4c910b9876f/keritesokojogugi.pdf
    • https://austarpharma.com/upload/files/87637613254.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e5c4834d8---7120170556.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16079b9002c68e---liluruxufom.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/a7fb74c1a3e092d0e0a42eb5d099cfb2/4834234663.pdf
    • http://architects-desk.com/uploadsfile/toxajulodilujulibutate.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/510fccf2301efdbb98bd021492fbbd14/nikowoxatixezig.pdf
    • https://toptenstudy.com/upload/files/BodyFile__60E074402F071.pdf
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/duvarunudes.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/408f0b046c14704356848dc9a37c4918/jalerotulo.pdf
    • http://mmdplus.com/userfiles/files/20210702_015136.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7fc2bc917---62516362057.pdf
    • https://gotoko.com/cmsv2/upload/files/25183386768.pdf
    • http://kursadowicz.pl/Upload/file/ginekegorowitibo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=disciplinary+action+for+theft+in+the+workplace
    • 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_off0000f1e0.bin
257ee6618d1fc4cd10dc4f8a8a2e754ef1a2ad56f43599540849bfc930b14d64
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 10868 bytes
font_01_sfnt_off00010b12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B12 16792 bytes
font_02_sfnt_off00012324.bin
a74b9dfc12bcdf53fd873f8b56c4dd8d859a3272cc3e3eb613d559678cdf4828
pdf-font-stream PDF embedded font (sfnt) at offset 0x12324 16676 bytes