Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2e819f772f5163a…

MALICIOUS

PDF

80.9 KB Created: 2021-07-07 17:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f74ba936b5217dc09b04cb6f2b36874 SHA-1: 5d86e5b204abb1078c52537d4e78573a2fc930fe SHA-256: d2e819f772f5163a1b3e2d3e8bbfde5d6161f469416fb1c1338efc16c42e5333
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. The document functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites hosting other PDF files. These secondary PDFs are likely designed to further phish users or deliver additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://inwebjor.ru/uplcv?utm_term=science+class+10+question+bank+pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/cd4812885ff2edb1d3718f4e275ca19f/veletivez.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd1f9555d7---milekubotazixuberuvupep.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/c5c88c7ee44e96773855176f0df64d61/42204077643.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609046266d091---kepos.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ean1t85p6s4bcd02l6c7i55m50/vanosababi.pdf
    • https://noddy.nu/images/file/59685898699.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e0d92ea77---2666762732.pdf
    • https://thietkeweblongan.com/upload/files/zunizavoju.pdf
    • http://naturallabs.fr/userfiles/file/95679374859.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086ef2b32b6d---45628862258.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b6eb5bad379671e55873441a0f12aa3/58038849463.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f60c6cac71---tivatus.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/6b14040657fcd5f2f414f04c913e9520/42089503982.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10783b2838---ziwazi.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/c5b4b2b1eba97fd7cf4cfa0b86846735/miras.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/27fcfef98184c59873f576b68cc5aa1b/sarigogubepilame.pdf
    • http://ccforum.kr/uploads/file/1625056143.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d25324b54cd---bezajusu.pdf
    • https://laser123.com/geektic/files/95110503867.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606efcd388421---zepexujarovupidoxopidu.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_off0000d884.bin
68e3f221e83c1ebd93e2378be96e44b68a6df82cdbba6907ae000b015a71f3bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xD884 11240 bytes
font_01_sfnt_off0000f291.bin
21a73acb3252275a401eed10873efddea2d4bc8f453c3a2e8709ccd976829a2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF291 16688 bytes
font_02_sfnt_off00011e21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E21 16792 bytes