Malicious PDF — malware analysis report

Static analysis result for SHA-256 264b5cab29e6e456…

MALICIOUS

PDF

86.0 KB Created: 2021-09-04 01:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eaddcb11f0664dbba9594b4aa4220344 SHA-1: 8ac0907b505953d9f6902d32906ce637beb76651 SHA-256: 264b5cab29e6e45649e7884e637a7b8a9abebb232ecfda399b6377a0f03d1fba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be generated by wkhtmltopdf, and the presence of embedded URIs indicates an attempt to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://cleaner.pl/userfiles/file/puxuwabavowaket.pdf In PDF document text
    • http://pcccphucvinh.com/upload/files/parokopobusutagafawu.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/zumavof.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/1a2ca8082ae6cfa7799b0bbf898ad802/21057546968.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/kibisu.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/35586499180.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a329f4ffb2---lafelewixu.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/girakixemujojugetu.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/78555312855.pdfIn PDF document text
    • https://nomortiga.com/contents/files/vifukirimubawonuxigikuduv.pdfIn PDF document text
    • https://x-software.cz/data/file/jazibalasofofolom.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/xofomovepa.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9699cd511---2925456982.pdfIn PDF document text
    • http://erictex.com/ufiles/files/36170914103.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084065fecf98---puguxijebiwi.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a6d40c347---83203591302.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/6f038f3dd07e6cab6140ca568b6d6109/69972700735.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160954d830dcc1---dugosujojevegomif.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/20710025599.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/df2c0c7acd9613f73953255a233475cd/mototodesuredepajodekemep.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7b52e73a772b4824f029c69445cca4e3/60236295257.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/86800531000.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/36708383457.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/28058579612.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16120115652695---52423294474.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/17608928746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=construction+company+offer+letter+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_off0000e9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FD 11024 bytes
SHA-256: 024069089fd964e104b3ded2791c98a89ed94a2f7b5e0ee90e118a63ea685ba4
font_02_sfnt_off00011bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB0 17788 bytes
SHA-256: dabf2ed521560d73694ceed7d17ac6bb789808fb46a1af040bec0bab0de438b4

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