Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d36b0c9f7eddeae…

MALICIOUS

PDF

84.3 KB Created: 2021-09-19 11:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3b6de23840b676910d73317cded22970 SHA-1: b8254dd5a5c6cb6e77825c0ebed672080e9e556c SHA-256: 1d36b0c9f7eddeaeedd4d9f50aa290e1c258fdedb88a8b9236e6fabca67819ec
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or IP addresses, indicating a link farm designed to redirect users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM suggest a deliberate effort to obscure the final destination. ClamAV detection and ML classification confirm the malicious nature, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://infrive.ru/uplcv?utm_term=kindle+app+android+not+working PDF link annotation
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcaf64210f---weriwiruvajajovuburi.pdfPDF link annotation
    • http://engroupe.ca/aym_image/files/bogus.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/ronugunej.pdfIn PDF document text
    • http://spbi.cz/res/file/40045620200.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/74199349776.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/lufopemasabovugulodivepe.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/7497b0df630f3de53de62ba8bd45c322/finezufelebe.pdfIn PDF document text
    • https://citronel.com/userfiles/files/lajasu.pdfIn PDF document text
    • http://pi-consulting.ch/download/dekaniju.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/puramejafobiseg.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/3a2ec023abd5a4c08f00dae67a0b5036/famikapisamatafusedabutam.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/bujifolefanedogepaxurida.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/92057209217.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/nulawuvudewu.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/78565997929.pdfIn PDF document text
    • https://artbynela.com/uploads/file/11339438251.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/lupupedawurupafo.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/gemisabeleki.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/64842897804.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/72502129964.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/8520157680.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/49b8fa8151f340878872fcfee8576b12/pufaminomewulizavevuxafir.pdfIn PDF document text
    • 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_off0000e697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE697 10568 bytes
SHA-256: 479a9a8364f9807c1c68bdf118096aa534c404558a4bb6993635aaa8f2d00cdd
font_01_sfnt_off0000fe95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE95 17420 bytes
SHA-256: 21b259b3102a0a2bd619b4d38075f42f869a1a438d87d6c4579afa8e39c5688d
font_02_sfnt_off00012bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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