Malicious PDF — malware analysis report

Static analysis result for SHA-256 df95f661ecdaa2f0…

MALICIOUS

PDF

92.2 KB Created: 2021-06-25 14:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 768b87d37bb91499ecaa05fb93fcc955 SHA-1: a75d3a6b48a78806f9dba67591c2ffab44540915 SHA-256: df95f661ecdaa2f0fd45f2e7935d40c697229d3bac32eea199f41e0a181f38e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://irlanc.ru/uplcv?utm_term=apa+style+meaning
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083b25ac2d66---faloruxigigesekomo.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/57pfku4d9je64chrrkro8aeith/14122111025.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074778aa8e4e---regalux.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/pdpfg8cot58geu76c22il118om/kalagola.pdf
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0529/910f418e72c8ed98b4f4444a8eee6f52.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/89vfpj36d9j3c1620ahj7j2bvd/46901626413.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2eeafcd361---zulebigazasataruz.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607f633c6c436---93754927175.pdf
    • http://amuseonline.com/absite/userfiles/file/28069196680.pdf
    • https://aprilboya.com/userfiles/file/bubaw.pdf
    • http://bettynblue.com/upload/fck_img/20210515/file/sufezoxut.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/nm5c1ml5m5aodq31bipdc2ugv3/laxopupixepivizakojux.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608bf17f21644---25600241184.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/1201644283b4bc769144542e4552e404/11408295700.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b789373ee---pabaresasuterer.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d3eb50144---43112213206.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/82644826681.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/7e81f80c6aba8f40face726fc11ec21e/37291658540.pdf
    • https://a2designbg.com/userfiles/file/zubakemirised.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_off00010685.bin
22259deb40f5bf11d0b8b1444a33a13d43deae8a1e946179d2ed2844e04fe8c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10685 10472 bytes
font_01_sfnt_off00011e58.bin
942d156e68e9fc2e0ce77cf925aa0048c590e9f283636eaafc29f2055eae75f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E58 17448 bytes
font_02_sfnt_off00014c1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C1F 16792 bytes