Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b2f533c063c07d…

MALICIOUS

PDF

108.8 KB Created: 2021-06-28 00:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e62749fc481d32c42780b5e71671486 SHA-1: 87e392bb8c045b441d443006ca5d9b5468bd19e1 SHA-256: f8b2f533c063c07db5b292668fb6dbacb437213b4139dd145b7c0cc230d8cdf3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9807

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://tlxzkj.com/uploads/file/170348129271.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160794101a18d2---lavozipajutibisej.pdf
    • http://www.allatpatikapecs.hu/images/file/wipowesofibono.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8937a4d62---89279345684.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c5cf8ab44e2b58a6d9ab7b525cb75649/nowivenasawogejovedosigul.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c780780586d---84329394647.pdf
    • http://gorisum.net/fckeditor/upload_file/file/rimukudigis.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/pdmccf8i3nvd8qtp5hpadmj3s6/24620827106.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/n0bomimce3bu4e5ggn6igbf1dp/20531944603.pdf
    • http://cp-1.ru/userfiles/files/jamuz.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a074e94dbc1---97013456402.pdf
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/dts55e7hjgjfpthtu19dtater2/36531719362.pdf
    • https://gloriouz.in/ckfinder/userfiles/files/88430289872.pdf
    • http://championshipsportsrings.com/clients/23492/File/62139744281.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/5aa25e6c61a99dbb19a9b560bfc681ec/wewugevefepiboginarazet.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/59214047995.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d18207a4b4b---vumelevilevasidukofaxuv.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d669e3a289---90248376266.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608395cba1789---pufosivovifid.pdf
    • https://pui-vital.ro/msg_media/file/26190891461.pdf
    • http://www.contectrade.hu/fckfiles/file/9311680653.pdf
    • https://photojet.bg/userfiles/file/xufilurimawevefubulisul.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160805c1ae17f8---28386367701.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/rap5qssbq81dr22acnqdibokda/13507008731.pdf
    • http://edgecs.net/documents/mukazigisaz.pdf
    • http://www.naraihillgolf.com/admin/userfiles/file/85212798620.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/c1549af0e5808adb749408d15541e0e6/wawukukedoka.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=best+states+to+live+in+usa
    • 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_off0001490b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1490B 16792 bytes
font_01_sfnt_off0001611d.bin
c947a1bb834ed2dffbab07db0b805003b2932e69a7f78d4f6297a8b28032041f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1611D 17400 bytes
font_02_sfnt_off00018ea2.bin
2f058edf4a7a843fd308089c3cfcb1c18e8414b0d3cbd04eca738550558e06f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18EA2 10220 bytes

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