Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d54553610d630c…

MALICIOUS

PDF

82.5 KB Created: 2021-07-06 13:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 361519b377e181f0c6651bb7461ca70c SHA-1: da60bd2d0b13452962a283a7fa7f685d506e8645 SHA-256: 54d54553610d630c1fb785b14a5330cf0f53f2ea49d70b8cb640764595a16720
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS uploads, suggesting it's used to distribute further malicious content or phishing lures. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/6d10a4b1e4b7114ba8d596af8d5db8b1/zakupinegawuridiziwodu.pdf In PDF document text
    • http://elitvorota.ru/f/file/51677310755.pdfIn PDF document text
    • http://parfumkin.ru/files/files/10144733877.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b812ebc58a5---4976350649.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/72977172288.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1c39655c90053ed08739e11d96ff42d9/50541850161.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5c5ddc300---gejabumorekuxemuzup.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d65e9a30eb---surofexoxinasak.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a9htuoh1akrqd6sukaku6pufm/pisoxuzogu.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/mafupamelalifusiwug.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/63vik57s07joht3j7onhfm6ago/61350121414.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721d9e8da2e---28330891301.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/d8ca14fb172b6a8cce12c123df04acdb/51425509262.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/f48d4a0d852aae9fed2b49f79fe84431/papej.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aabd6499d30---rinusipesafelu.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/febevaxunoxikexise.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f05451327b---24220869081.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1623772737785568510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=4+types+of+woundsPDF 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_off0000e245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE245 16748 bytes
SHA-256: 4c0f6728e56844a6d7ec256b231198da19a9d3f247e38cdc74f6a8a4da4b5081
font_01_sfnt_off00010deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12602 10372 bytes
SHA-256: 9a163068efeb63da87fdfa1de8b39daec96aa09e60a6f63db474343093141964

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