Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9172f4b736e2c0e…

MALICIOUS

PDF

84.9 KB Created: 2021-09-05 05:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 635649f90bb55600b2536cd17be81297 SHA-1: f86a470986a587c6a79a6e76019be2f85950ec1f SHA-256: c9172f4b736e2c0e954cd252a567a7e070ab9d7a0fa0f412c5e23086047c2b2f
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to host malicious content or phishing pages, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://tremonttemplemacon.com/clients/862779/File/neverazavogajoniwu.pdf In PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/39384001882.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be07251541d---72089630915.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/pajotozofulibosabuwiwo.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/74acd7f69ba36bd550e08aabe746c011/5927577818.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/icr03vh7jdfpurq2mjrl00f7ja/nowip.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/pawifexibadupujefupiru.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/fapifufin.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/gubeniwo.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/233090587a96dab5bd7787b23bddabc3/42007774338.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/lijirenobenoxefije.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/33517636257.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/3855894135.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/zofebonutozefidemi.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606eca8f7de19---98602418072.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/zawej.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/64982205560.pdfIn PDF document text
    • https://cristalensi.com/public/File/1888981676.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/26393748950.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/tajuriti.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a288689cbf8---toniwafi.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/redowuvev.pdfIn PDF document text
    • http://zuestag.ch/userfiles/files/xezalakaritokidezezaveg.pdfIn PDF document text
    • http://1976ahhs.com/clients/32223/File/lekefapilabagapibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=usmc+leadership+traits+and+principles+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB5 10772 bytes
SHA-256: 47a780cffa975b3173b0931a872f54d0c46db7d1d842fb347d0b8dfd237444d3
font_02_sfnt_off00011641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11641 18728 bytes
SHA-256: 30c5e8a0be5a2d90e48cae210debc90e669af26d91c74b194ea7f63a27c7de91