Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9303852b8cc4471…

MALICIOUS

PDF

104.3 KB Created: 2021-07-19 18:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fff9b99c87e8a33ebd5a7faeda2213ce SHA-1: 2807b5b3350a960cad04754344acae7bab31eb79 SHA-256: a9303852b8cc4471b2488c525b446031eb75c92db11f6dc8342238b463f4bf49
156 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation by directing users to potentially harmful sites. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://okulsanmalatya.com/imgup/file/zidirasu.pdf
    • https://canevastoilestjean.com/upload/editor/file/denamibutowetevitikefoju.pdf
    • http://nutranghongngoc.com/media/ftp/file/53804455769.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d4272341c---widuzajoluw.pdf
    • https://muachungbaohiem.com/uploads/userfiles/file/93624945937.pdf
    • https://comtraining.cl/userfiles/files/dupadowija.pdf
    • http://mesamiesdallas.org/clients/e/ee/ee8f1390623de39be1ac2b47a321719d/File/32196221896.pdf
    • https://alutat.com/data/file/zidimiburakobubetokosag.pdf
    • https://www.alapan.org/fckimages/file/50078372447.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ff1589de6---24791611738.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb498b57e5---48761571211.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecfa38d8dc---tozitu.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075e232ab157---56957257466.pdf
    • https://mmszke.hu/files/file/27827326035.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/2158593b88670c46d90b7bb23a88a944/64584036027.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//63468240758.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/20ren2ekv5ohuo87ikleieav9q/jijara.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/123eb6240a62f7e2b38a71c8a2438de9/22235227451.pdf
    • http://taxicityplus.ru/userfiles/file/gagulomepowigazigileda.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c722944119c---worevawumesajalakego.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bf797a3aa---30710101525.pdf
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/42357744190.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=starting+out+king%27s+indian+attack+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_off000134cc.bin
395693e1bb82541190c9d696e72825a21361fa5679347a3f1b29a04abad5f27c
pdf-font-stream PDF embedded font (sfnt) at offset 0x134CC 10920 bytes
font_01_sfnt_off00014e0b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E0B 16792 bytes
font_02_sfnt_off0001661d.bin
87f76bd11674e11a1a82bdf62fb03e1f97d2b59aaa0ad8a93f546fd05a9343e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1661D 17532 bytes