Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa2ce890179df17c…

MALICIOUS

PDF

86.0 KB Created: 2021-09-04 02:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 581bc95ceb8d539c4f6d647016415bf0 SHA-1: 8362a17293e70d4aedd131b97d6fa5e1e1cd8561 SHA-256: fa2ce890179df17ce585332c94aefa723bd7c4589d0c9204ee51a8340109e14b
164 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, directing users to compromised WordPress upload storage. The presence of a 'download button' lure further supports a phishing or malware distribution scheme. No scripts were extracted, but the overall structure suggests the PDF itself is a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918df73a4e5---fitixiganuborakotijofupol.pdf In PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096bce67fc45---gujedoz.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/6e89f892d3d40cc2cb2e51998229d7d1/44262232742.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee1a2dc107---85989620488.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92e7e4d36d---48490007501.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/a98fbe99e6b0b7f8372b1c3fb1571027/donejowazunonazuf.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/46877593396.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081268b423e3---dafek.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/zotigutibi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cbe3c61b6---9033473651.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/17474533280.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/54324601452.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/fupigojir.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160abd0be7196c---77977552968.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/7f7bbd4baebaaf735722bcf4b5841883/xogudefanut.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/kogosupasu.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/0be071a1be1d9dcf5a7ca3ab0627750d/xeragikidifunani.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/39746335488.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/xajifesuk.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/sakuvupojufi.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/27046090963.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/ac1447adde2215831203f0672ecb7836/revedopipedabitizafil.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/merowux.pdfIn PDF document text
    • http://yibetter.com/data/files/puniloz.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/bepegapijuduxifig.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c9609f85b---26723072972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=employee+salary+certificate+format+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_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 10772 bytes
SHA-256: a47d01165f9c6f934b82b916e4a1980fcc85533ba7fbf6d2b1a2e7f0704d393f
font_01_sfnt_off00010450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10450 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C62 17748 bytes
SHA-256: a72d3e079d91286f56c94a45ed7d246b038e341894e0c3a28301f2792c5c4765

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