Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d3847a01f8435a…

MALICIOUS

PDF

78.2 KB Created: 2021-06-30 22:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 253644fa56ff1d6912e8afc69c0a0e79 SHA-1: f944a1b079c8a404eee8eebfced1286c3d8a45bb SHA-256: 75d3847a01f8435a09d5d98766df90e07296c21ee2cd6432368d17b985c29b68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other potentially malicious domains. The primary purpose appears to be directing users to external, untrusted content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://drafthe.ru/uplcv?utm_term=lite+groove+is+in+the+heart
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/alt22111dkfspqcvknv5ldv1gu/5761470016.pdf
    • http://kiiga.ru/userfiles/file/riberiv.pdf
    • http://vom-ragnaroek.de/uploads/file/48906406886.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d113ee9c07---61072858230.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160854bced0e43---90081682410.pdf
    • http://dalnoboy.org/data/filestorage/upload/files/12250646190.pdf
    • http://newo.ru/files/files/8923439143.pdf
    • http://poolprotektor.com/userfiles/file/mudidejasogivugupinubim.pdf
    • https://flyags.com/editorResources/file///98238523745.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0124a904b---govunajej.pdf
    • http://illinoislivestock.org/userfiles/file/fozozexuvozoge.pdf
    • http://grupophi.es/uploads/files/zedubivekotifi.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/676adb885eebb3e5c3b49fa26a5826a8/vetexukewinokakutujixem.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/5ef4b0a16644ec58524ce1fb7a590d10/40358679454.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076d8dc557d5---rurudejozemedepar.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071bc85b912f---77088722773.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/r2oudsddngkt6rk86h9v4dl6jk/1889393361.pdf
    • http://msinziniering.com/userfiles/file/wupujafe.pdf
    • http://accessprecision.com/userfiles/file/sedoxaworejolis.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/m9q7nttrmor7ie46ahfa5s5aq1/fuzibowovitagalidat.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94febfe50---dibipewinanexod.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/komesijakufabosinetekuxax.pdf
    • http://gptools.net/userfiles/file/87222452141.pdf
    • http://ahcxdq.com/uploads/file/290750195534.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_off0000ca4f.bin
bbb29eec82e1a3771fee06abc3edba95521d7d4f83e9261403250cf1d84a9b80
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4F 18724 bytes
font_01_sfnt_off0000fa7a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7A 16792 bytes
font_02_sfnt_off00011291.bin
9f9a98d3e98d365ac9a45f0d84615926329f4d264c112758283c08dfa972a02d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11291 10364 bytes