Malicious PDF — malware analysis report

Static analysis result for SHA-256 09afc5bd07520d5b…

MALICIOUS

PDF

69.7 KB Created: 2021-05-03 01:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d11f7717eaaae806ecbb58099c99a0f7 SHA-1: 20e89916ea9c69608ac51aadcf3b5a6f6a68d8ce SHA-256: 09afc5bd07520d5b58fed294d0ee4ab67dfe5681d6266f8b1c5e3b153936db21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to host malicious content. The document body, though heavily obfuscated, appears to be a lure related to hunting scores, which is inconsistent with its technical metadata, further indicating a deceptive purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160705f2ed4040---32932171949.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb261a2190---56169114027.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd76346122---toxoletudipumefunusa.pdf
    • http://www.odnpoznan.pl/fotki/file/file/kavawirafisozolazotu.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160732c1206aaa---wamuxevibizunup.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d125eb8330---99291065006.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/3e661b6d43d7258c4d2f2f3d996b9552/53369826103.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3ed926af4---38691511194.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/05d3836488384b0c0e0937a45eb8b028/40803036895.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/539ff19dd6eb42089267cd3942b81592/zunafomabogovobovolarafus.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608768d06a57d---52164100857.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/f41b13e878440a968538daa7c6725816/darufegemetufiw.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/61e5e3c9849769c1542d0a09e47369e8/89680675838.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf97d72f7d---72122750575.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1db47332f---30819647741.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=boone+and+crockett+antelope+score+sheet
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4b5.bin
43123dc7860418e00973cf38b551980b9c2dfa0dfe238c3e56cbf2bd162ad09a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B5 5272 bytes
font_01_sfnt_off0000e69d.bin
98a49bf3679c1a85264d72c52ed847811edc014435a6fb03d513f498a36268ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xE69D 10240 bytes