Malicious PDF — malware analysis report

Static analysis result for SHA-256 329e467c9695b559…

MALICIOUS

PDF

80.8 KB Created: 2021-07-21 18:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1d1aa40ea8a2251d600ca0e6775c6571 SHA-1: f23a0f2a757e53a12ec4546d632776c53558b2ed SHA-256: 329e467c9695b5595d7ca2c44c59392945d45fb82ccbe1e59908fbcd62a9eaff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or redirection attempt. The document body is heavily obfuscated and unreadable, but the presence of link farms and compromised hosting indicates a likely attempt to lure users to malicious content or phishing pages.

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://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/93bjpic6ks0oke0sd65ihmjtt3/pubopuwok.pdf In PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/15064096508.pdfIn PDF document text
    • https://www.disbel.es//ckfinder/userfiles/files/44992893770.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/0c3e4ec014a1fb79c288efc707d5c8a5/85590782901.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a93fa370360---91536637124.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a51bea0cc---lesobusazusixa.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/79842742723.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723235e4ea1---daxixadejexizinepogoje.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/pitamixusaj.pdfIn PDF document text
    • https://eternalbliss.net/file/80840780394.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ui84ner5vib272lq5887cr1ij4/57636291203.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/filuz.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/77770383201.pdfIn PDF document text
    • https://buka.ru/sadm_files/92390093824.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/digofag.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/46883534583.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1f1157815---41373003766.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/pf6qgd0f8dg5cdog6c85gpq0sc/3802765159.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5fc7239e75---18403457159.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aba60165168---90954225540.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/b53f285a10cc1baca493653fc8c8513d/gizezekujax.pdfIn PDF document text
    • https://discoverthesky.it/file/30974175110.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/garugavivorikezarevele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=arden+hills+drivers+test+coursePDF 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_off0000d961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD961 10452 bytes
SHA-256: 3bb37c59ff044ed359f52adb9e1458867e64c98c3f20f8eb65877bad9784c19e
font_01_sfnt_off0000f10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10C 17008 bytes
SHA-256: 8544f7031fdb7fd549b63eac226aed3e2cde130da4f30bed69707fe62ffbc22e
font_02_sfnt_off00011d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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