Malicious PDF — malware analysis report

Static analysis result for SHA-256 790686c801c762de…

MALICIOUS

PDF

73.3 KB Created: 2021-09-20 06:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4154667eecd2c077b8f8e1bb483e5815 SHA-1: abf141739c41f1a153b37144547a02aff5ee084a SHA-256: 790686c801c762de3c02dd4a4cf0f643823dfed2652bb3aec71448f96723a569
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection for phishing and trojan activity. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the presence of numerous URLs indicates a focus on external resource access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://travelshops.pl/userfiles/file/nobemegosafewesef.pdf In PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/c48a150d78f6a3d5a8fa6edfcbf5fa34/puvawirawewamir.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ep3jp55hgei91t9de27vhgsurn/18760834610.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/nuderiwiseburibemagesut.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210913165421.pdfIn PDF document text
    • http://specimport.by/files/files/bekolizutigoxixiwu.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/37821728462.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/20697566014.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613967975feda---23595708905.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/69554177686.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/759930fa5d26d746befd44d0ec62fbde/71369159856.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210910090815.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/28026703956.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/pidopusubanutomug.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/vepigofopojasafusupe.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/59821755015.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/99296073929.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/76584388383.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/jakipi.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/tevirumu.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/gegamizarumabewu.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/85279282589.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/cf5f11dde2d341d1b6884850b444132e/tofokifozemume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=chemistry+matters+gce+o+level+2nd+editionPDF 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_off0000ba78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA78 16592 bytes
SHA-256: a8722c15c21a156fadfb2139c5ff64a8516a076da4e95e7245e30636f518aac4
font_01_sfnt_off0000e576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8D 11148 bytes
SHA-256: 448a637a1b98f8d0da0a2714b4c333fa0581456f80777b4e7336932b94470fb4

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