Malicious PDF — malware analysis report

Static analysis result for SHA-256 96c612af0c6ba5a3…

MALICIOUS

PDF

95.1 KB Created: 2021-09-11 19:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 405288904708b949f58acec857bbb9bd SHA-1: 4186337ca026d2ebd85b0cd91d27e0baf8575224 SHA-256: 96c612af0c6ba5a33b5fd097f5b1b9b6d443b9b2ec90bc25b3b296c85f56974d
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to what appear to be compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct textual clues to its purpose beyond what the heuristics indicate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://dinskayarealty.ru/media/file/vekapepowej.pdf In PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/2cd446a14eaa701fb4f1d6fc36799846/2694639688.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/pozatobijim.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137451117307---gunenidavow.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/kowiwa.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/40553130891.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/xibagexufosef.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301a2f57578---tetafikovewala.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/zagizizomijubamifirex.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/jewupudawegezavuwime.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/ludafowimebuv.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/buvuzazome.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4bfa57f39---56538616554.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/menawagukixulimawo.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ggmc2l6tn55l1u3oqbd8a0a7d7/73091551881.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/salufudefovapepagunututim.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/51731489683.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/motirapenan.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/kezonerukenukasabu.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/63308749797.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/96689854689.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/39810518359.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/levajokukunijuxatugorejor.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb0971fe62---62701320492.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/60345365954.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/70376944224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=filosofia+de+la+imagen+fernando+zamora+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_off00010d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12526 19024 bytes
SHA-256: b7da2a8bb6b5da74f97c5c6f86d5ea79ad20175f9099a1eda560ea974feaf9cd
font_02_sfnt_off00015624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15624 10780 bytes
SHA-256: 48f7d48ab365436aa32815815435baf2bf744bf9cb251996eef221afe9502ab7

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