Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb93d0d3e5ef89b…

MALICIOUS

PDF

84.6 KB Created: 2021-06-27 18:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9f6312c14bdb3d43dd2f22d011cbbd6 SHA-1: 80c8681f383182204a071f27b6b98e41a06dd9eb SHA-256: 9cb93d0d3e5ef89b723372ed1cf828e51ab1fbdf61495520204fce8095250366
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised websites, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the link farm and potential phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://mp-hd.de/data/aktualnosci_imgs/file/40349391291.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/157848606381abf476e22d7098976a4f/saleronolaju.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ac658a49e9b---79626029937.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f80da3df3048f33a2ca057b9b521a01a/niguxunafegeforopoba.pdf
    • http://promador.pl/userfiles/file/kokixaluzuja.pdf
    • https://doanhnghiepvietnam.org/img_duhoc/files/serasareziguvo.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/c56770c29394a8fa5e94434eefee7742/bulujisobugufa.pdf
    • http://tradeweb.es/userfiles/file/25937826687.pdf
    • https://acronimocostanzo.com/userfiles/file/josopijolivefefipugudu.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d88e3b2f118---90540563423.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f29e374d8---bapol.pdf
    • http://biancoacolori.it/userfiles/files/45929777557.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a15d42d91---38575465206.pdf
    • http://zigzagontwerp.nl/sites/default/files/file/duziwetusukexegadelufiw.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bff1a8423---33209477423.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/pahki1iuuh71htt9tb9426jcrr/28621204288.pdf
    • https://aradovan.com/userfiles/file/tuwepukerekipinosajokuzi.pdf
    • http://dyglas.com/userData/board/file/38772215572.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c027c15a134---pivexorixetel.pdf
    • http://ecogestval.com/userfiles/file/91101923913.pdf
    • https://augsburger-dartliga.de/uploads/file/nexikoraname.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/o092k7u7t2o9rd5qmhd3shaddk/xedosudajiku.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=3ds+max+tools+and+uses+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_off0000e56a.bin
18521f8045bb9e336869bc8872e0332bafabdb8c186e1ea8ca8737d6252c0e7e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE56A 17408 bytes
font_01_sfnt_off000112fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x112FA 16792 bytes
font_02_sfnt_off00012b11.bin
cebcd667f7caf38c7131387bfbd2c8b4ad5d29f162ad5eb83ff1efdd61179251
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B11 10744 bytes