Malicious PDF — malware analysis report

Static analysis result for SHA-256 c891cc69cd72b2ce…

MALICIOUS

PDF

78.8 KB Created: 2021-09-08 07:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d6ca80bfe4d61c538f3a9b48157d6f69 SHA-1: a77b139830507b9937eca9493be53de461c34370 SHA-256: c891cc69cd72b2ce69c586cf6583253285e3164eb00ecd89d4b3ed4f083d1aa8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608675e386ae4---kaxavoxu.pdf In PDF document text
    • http://metallpress.info/files/90831348563.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa782830b---gixilexexife.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/27358231608.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/bitalasakaxusutut.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210714145722.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/pozanalezewekiwitewe.pdfIn PDF document text
    • http://henca.com/files/details/file/sinubatasaduzevu.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130f6206015d---80503821326.pdfIn PDF document text
    • https://shiokerbau1.com/contents//files/5131282207.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713c382b4c9---fekalovitutupaxexapejupat.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160f021a0eb077---44727784488.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/87612d5dae89f8a6a1f5eb5068119763/setemapedalebirugaz.pdfIn PDF document text
    • http://614move.com/clients/4890/File/76778151646.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/99627281171.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/87576090984.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/nakidaxodozexinerivaz.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/32083311706.pdfIn PDF document text
    • https://festacontinua.it/public/file/56674747515.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161115b602c0b1---70007130060.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210721005125.pdfIn PDF document text
    • http://envigest.cz/upload/file/sojakoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=textbook+of+pharmacognosy+and+phytochemistry+2nd+edition+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_off0000cb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2F 17856 bytes
SHA-256: ad8517d839164c66b04fcfa27fa881e0d9c2f32cd3aa917317767b8e82828cba
font_01_sfnt_off0000f9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FE 11552 bytes
SHA-256: 868fcc0f5364dccd57eb22e9be07a4ad0fc0b1b780946085de6dd78a7ee32c1f
font_02_sfnt_off000114ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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