Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39db985345b1a56…

MALICIOUS

PDF

83.7 KB Created: 2021-08-15 07:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4d4d3c767beda19a71e1260958a0a7c SHA-1: cdc059bd34b4312c71de303e69e0cc226983c026 SHA-256: f39db985345b1a56168f5f26eb2c74d627347ba715d41f1650c0858f35343e16
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or are structured as link farms, suggesting an attempt to obscure the final destination. The presence of these links indicates a likely phishing or malware distribution vector, where users are lured to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/593b8ce5d4ce006b8587b8d67fdd1191/40313974124.pdf
    • https://morabia.fi/images/file/zekona.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe3323bbe6a---pibuwok.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160925d7e82e84---3733299831.pdf
    • http://abwhopewell.com/uploads/files/85907763389.pdf
    • http://fujiya-la.com/uploads/files/demamagaravomijujuzokenat.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/80583bd361c60b0de2667bbfadd77da8/reborujufurularetu.pdf
    • http://tumwebthailand.com/ckfinder/userfiles/files/tokuru.pdf
    • http://hkacca.com/userfiles/jinemekikej.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/4609909f7e5d892aa32be0b5093327cf/96217815043.pdf
    • https://cooperspick.com/files/xewerug.pdf
    • https://homecareangels.ca/files/files/files/dimamesumagukemerifir.pdf
    • http://intergeored.com/upload/File/24556742275.pdf
    • http://mikomisushiwc.com/uploads/files/86364696699.pdf
    • https://matrainagycsalados.hu/userfiles/file/48960097067.pdf
    • http://dolphinegypt.net/userfiles/file/61142025311.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/df0532c29e3969cd39e87213e4853486/7238461279.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/04cf0b5071b39bedaccf99a2de1a86e5/nemikigadaxu.pdf
    • https://confetti-seasons.ru/upload/files/71242712082.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9460e8e80---wireguvejujibupa.pdf
    • http://dolphinkorea.com/files/files/34777095442.pdf
    • http://szakkepzosiklos.hu/upload/file/69086847377.pdf
    • http://montaze.org/democms/userfiles/file/wenerirowuw.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cecaf6bc45---56977125978.pdf
    • http://matkinhantai.com/luutru/files/bezikajuxosexaj.pdf
    • https://festival.bg/fckeditorfiles/file/48581501048.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=can+i+create+mailing+labels+from+excel
    • 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_off0000e291.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE291 16792 bytes
font_01_sfnt_off0000faa3.bin
a0d6086b9f4a5396023bd840a07e5c8defd06e966dcf6bc6f387e52a6fdd618b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA3 16680 bytes
font_02_sfnt_off0001262c.bin
69e77b0bfc0de23a9923ae0867f7a42b992688c436e6df905e8aab9971df29be
pdf-font-stream PDF embedded font (sfnt) at offset 0x1262C 10952 bytes