Malicious PDF — malware analysis report

Static analysis result for SHA-256 d179f6b871a73cdb…

MALICIOUS

PDF

84.1 KB Created: 2021-09-04 06:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8c18ba06358f9c41daec2a325d9cb170 SHA-1: 6eb29d5551a3d3c26c419ce8f4b94c4aa85fc268 SHA-256: d179f6b871a73cdb9d86e3d662bf390539df446f4d6061f8490d447fb0817203
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 ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://zweefvlieg.net/userfiles/file/12305805450.pdf In PDF document text
    • http://x04ydivan.ru/userfiles/file/43310113423.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4fcc4ad3c16d4bfc632fc5c42cedf0e9/junojekexixobetikalezi.pdfIn PDF document text
    • https://totounited.com/contents//files/furozipiti.pdfIn PDF document text
    • https://langumeistras.lt/i/File/43321452626.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99fb5d55eb---vofududazirukuj.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/80282240814.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/26980848287.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/34831641552.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8f8f2f774---karefegakaxubon.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/51665417932.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/xuwukinefafinuvizo.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36a811d85---98658167984.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/94828827109.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a7c14a380263cf1482d6700f67203fe0/dolenufomutu.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/35704228535.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/doxavakomedineraxitoloxuf.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/f048b058fa43e6343c49757ec39cfb3d/jejevedisivirupezuzubipi.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16114306fcacb6---62009220394.pdfIn PDF document text
    • http://ore-processing.ru/d/files/gexemi.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/62850432005.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b04de43c4---38535367967.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/kugazugomaje.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/zidunare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=7+money+mantras+for+a+richer+life+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_off0000e2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AE 10952 bytes
SHA-256: 345c29d85548395509e04af70ab568d02d6f1ca883451e87e2d8cb6bf13e2691
font_01_sfnt_off0000fbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE7 18080 bytes
SHA-256: e995d5cec931827e2ab5e5fcd142e56a88cf8c4333a9c6961cbb25f0b8f86959
font_02_sfnt_off00012a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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