Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b9d31645432cda…

MALICIOUS

PDF

97.3 KB Created: 2021-06-21 10:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bab299a32ac522dede5668f69623390d SHA-1: 9b963887ca08d1be548f0d5194792208fdf28705 SHA-256: 61b9d31645432cda0d66069e1cdab6fca25c48c960b47941cfb10f6e347a2fc5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress sites and utilize disposable hosting, indicating a link farm for SEO manipulation or malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbc0264499---geberizukubeta.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071cc2f587f8---37310135519.pdf
    • http://georgekoldun.com/var/upload/file/99341709907.pdf
    • https://akproauto.com/nbloom/fckuploads/file/kawan.pdf
    • http://beijingbeat.com/contents//files/82807170014.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160823bbf599c7---6205995834.pdf
    • http://bjallstar.com/upload/file/xugusipow.pdf
    • http://euroinstytut.pl/galeria/file/87784523541.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/98c1b2078e94d6671326ab4c56cedb70/jarekubodudaxenoxulopelo.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/18933a1b8a78b09f165f6569afe4d84c/96378502427.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086c9256dc3d---tezetaxudatexefag.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19f420a30b---kivimikuwoduxoguzu.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/2798911ca6bac5e15c4d9065fef9041e/44801184091.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/tjv70i44a6l663j31kvl19j0ta/99540102647.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efb3353a1f---pepexezitukufo.pdf
    • http://amdind.com/userfiles/file/75480609733.pdf
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/42029760887.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=lego+batman+2+cheat+codes+xbox+360
    • 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_off00013877.bin
3b09dc9f79778803c1b751e1c91b917ce3e3be60ab489f917dd398bb201b2482		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13877 5964 bytes
font_01_sfnt_off00014c9f.bin
ceca4d6ea4435d33cde13cad06f0058a80c30e197ad1536cee65d5018f1cdea6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C9F 12356 bytes

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