Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d5f3a4819ca90a…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 16:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b3ebf177408eb5131675d27d5c26e57c SHA-1: 32c8e467f9224511c28f0d1e8441a8776b0836f3 SHA-256: a5d5f3a4819ca90a0159b9f83e164acb57ceda50668ce98b9ac33a9cd5e88269
236 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, and it contains heuristics indicating it's a link farm on compromised CMS uploads and a lure for browser extension installation. The embedded URLs point to potentially malicious content, suggesting the document is part of a phishing or malware distribution scheme. No scripts were extracted, but the overall pattern suggests an attempt to exploit user trust to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/20133572763.pdf In PDF document text
    • http://artechq8.com/beta/uploads/files/41234205250.pdfIn PDF document text
    • http://bociany.sk/media/file/26327156132.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8efea23ec---senaw.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cca9bfc3d07---ruvasosazoje.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/pupetizunewuwovidudi.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/3529068256.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/gatuvifilev.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/66723906575.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/detumeselu.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/vulowijojoxuwizu.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07c817a9c6---46668614051.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a733a3bf42d---75576252633.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/molow.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b51c1c8a8ff---62768029324.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/dugovugitabelo.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/1acc801fe79fa26180ff1ae03ec91c07/pukufolikom.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/bf3172b4438edad0d6cf7914395b49d4/temib.pdfIn PDF document text
    • http://beiks.info/public/file/sikuragolow.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160f1f3ea3357f---73659740705.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb30cf40ef---fonafexewagebarefidug.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/dowigolakosalo.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a598a93bf3d---luxat.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612bb70fe4424---sowipevozazep.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/17916667249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=reduce+pdf+size+below+80+kbPDF 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_off0000e0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B4 17488 bytes
SHA-256: 003ad6b893a2d93d106af4a3d52ae910a0edc7bdc5cff1320477c33ff63c3a7a
font_02_sfnt_off00012613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12613 11000 bytes
SHA-256: d67abcabec0444d7701793bf84d032555bdb6e4e72bb02837d4315e28a4c4367

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