Malicious PDF — malware analysis report

Static analysis result for SHA-256 438e3f26c4da8417…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 04:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e2c961d2438ca85d45a84a2eff9b7a6a SHA-1: c837aad3beab39a7fb08edd7ac313fe2331f072d SHA-256: 438e3f26c4da8417f648949376d361bd3c125fb730b416571822377d264faa01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://sheenabusesandcoaches.com/userfiles/file/98000019928.pdf In PDF document text
    • http://msdoubrava.cz/foto/images/file/lajorugotavojawad.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/34762014384.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/bexoxexagimonelo.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/vezemixakavofupiwotadiku.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/91313788471.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/22373180313.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16135e79e5353d---90734694798.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/kewufesotaveboxeg.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff16a84aca---41939816880.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/47520538992.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/43814893119.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/45989054549.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/67813099145.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a74c8a5840---pokevelesiluxo.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/pudazawawagirejitodeg.pdfIn PDF document text
    • https://2winit.com/Files/files/meposefuteje.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b35f5e1d6ded2966acd8a58b7c69d2ec/pawifepakurej.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/71881568205.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/liribaziga.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/sejutokuvo.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210901202351_851402182.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/datajizomogabekov.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/94633397589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=kakay+da+kharakPDF 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_off0000d6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C4 22524 bytes
SHA-256: bdcfc14b6e76af03e7d1a50e9d68b8978f9fc1bb56d06da34e90aecb3a5e432b
font_01_sfnt_off0001114b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114B 9780 bytes
SHA-256: 814e3b90c878441706b6cbae07fec81467c67962911fb4503e1e509043e6d6c0
font_02_sfnt_off000126c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1