Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf6575c3e773050…

MALICIOUS

PDF

82.1 KB Created: 2021-09-21 04:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 58b7897bb0c1ea3c7e75727bed00b704 SHA-1: e1ecc0fdc80b2cdff53f9742ba64e29210d9d0bd SHA-256: 5cf6575c3e773050a7278656768f43a8986fcfa46e3024478cf0686d75a4a566
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and other disposable hosting sites. These links appear to be designed to lure users into downloading further malicious content, potentially exploiting vulnerabilities or delivering phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161355e0c6a7e2---37568911572.pdf In PDF document text
    • http://saluteebenesseresas.it/userfiles/files/24208434301.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/72163327715.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/13430512712.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/gavas.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/zeguruzuvezalelojarodej.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/lhbll7vp1ikl70l05v5f7frl2c/72831664222.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/katezuxalirujinedezuvero.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/gusogolukigexol.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/4fb98980e8ba532e5cfedc901eb6a8ff/pololovubulipigodik.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/mukisogevejaja.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/wapodosazinalofuroxuv.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/medijaludikebajaropos.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210917124923741.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/geruxivazif.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/dowozumetakaxerel.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/ruxitigit.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/581761161.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613053ab1ff31---wawiwig.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/ninabonuwifazuz.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/98026691829.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/jedetale.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/momifopofubadibopigotag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=framaroot+pc+downloadPDF 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_off0000dc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC07 18192 bytes
SHA-256: fd3e5931eeda148d559a699594a0b8a27ea2bad6e3ef68b8c97b43e0e53f5a80
font_01_sfnt_off00010b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001233d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233D 10348 bytes
SHA-256: a4b36e0f2d49d87b3eea010b035b754cb624233c5f375c45b92cfa36e49a786e

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