Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba06f711652c723…

MALICIOUS

PDF

86.3 KB Created: 2021-07-04 01:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 918263073f2d14a64b15f28fbab688f5 SHA-1: eb245570ccf5e2352640af8e9116c28479d67b42 SHA-256: 8ba06f711652c723ebb4a73d20ec31e4c39adf46775fe657f3a3a23de55606bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to various PDF files hosted on compromised websites and disposable domains, likely as part of a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the link farm suggest an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://kxnjl.com/userfiles/files/muwumasaxumetiduxelala.pdf
    • https://viticoltura-enologia.com/file/tidavokipegivajaguru.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bd460c418---6208049166.pdf
    • http://akssert.com/userfiles/files/figoxasufuwa.pdf
    • https://stef-nancy.fr/upload/document/wekogawarulototofiwagiro.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/js39969r6vm7js1qm4l4ln42nq/nusurilebupide.pdf
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/80503319665.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/d5cbb23350562b521f91c2bc4a7652be/37969601546.pdf
    • http://klpa.net/userData/board/file/36943348798.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d3eb946ab---63492058607.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49c82ad7f6---neluwizekeru.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088c0646be04---vitumafomodisuwipor.pdf
    • https://tajeer.co/userfiles/file/1507337463.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b69b97de9---68483934941.pdf
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/54486451153.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/9d440a5b632bf028b99d6265ea2c3e4c/30192611332.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02cd91052b---84431667546.pdf
    • http://brainbond.ro/userfiles/file/narodiwozi.pdf
    • http://aps-mes.com/files/file/koritawuletakiruke.pdf
    • http://asbufestival.com/uploads/FCK_files/file/18761839162.pdf
    • http://bogelaipigeon.com/upload/file/63070320603.pdf
    • http://odmooregolf.com/clients/e/e7/e7046aca88cfcc92de0be8f3f6b3de3d/File/busufijodagasi.pdf
    • http://xinyaoqiye.com/upload_fck/file/2021-6-29/20210629165046152697.pdf
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sanazevifizex.pdf
    • http://adamlegal.com/userfiles/file/59989909301.pdf
    • https://wemservice.com/ckfinder/userfiles/files/64724124721.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823dfc3dccb---tepopimuwogibilufusab.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=foxit+pdf+free+download+full+version
    • 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_off0000ecd1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 16792 bytes
font_01_sfnt_off000104e8.bin
b85a56fbb7532e0db7575e8b556c92de7522edf195f1cacddc7acfce919dc877
pdf-font-stream PDF embedded font (sfnt) at offset 0x104E8 10820 bytes
font_02_sfnt_off00011e15.bin
ace16f78ecb856a3463f9668fa8ee40c9495412b50eb45df93ee17535a84999c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E15 17536 bytes