Malicious PDF — malware analysis report

Static analysis result for SHA-256 493dece8e5563490…

MALICIOUS

PDF

68.9 KB Created: 2021-09-29 11:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ca2651613fa5eaf3af017a9ff033cfec SHA-1: 6fc5537e853f06a75665df9a8dd7d9fa5ada3aa8 SHA-256: 493dece8e55634905b16dd5420ddc6577ed05c3631b6e607d7b8f734668938d2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. Multiple heuristics indicate it's part of a link farm hosted on compromised WordPress sites and disposable domains, aiming to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a second-stage payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cructi.ru/uplcv?utm_term=android+pc+wifi+file+transfer PDF link annotation
    • http://jandebruijn.com/uploadimages/files/79735381513.pdfIn PDF document text
    • http://afro-safari.com/upload/files/zonani.pdfIn PDF document text
    • https://techlan.pl/files/file/jemuv.pdfIn PDF document text
    • https://energooptima.hu/upload/File/86329943107.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/muwelezep.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/xapagevadinudufifolewifol.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/wemerapurinumazenokufotuv.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/53597094968.pdfIn PDF document text
    • http://culvercity.ilovepokebar.com/uploads/files/2486541965.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc4c0ba514---witoza.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/5fd91979246184d9d3054dcbe1e748e9/xapug.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/daxugugerumuraxunov.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/8297352101.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/815984116.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/mosub.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/dokogojukipemo.pdfIn PDF document text
    • http://machin.kr/userData/board/file/vomimukewebonojatup.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/49545663183.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a27a1b7ed---giwigefetid.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/vetesedobodejetomaxuz.pdfIn PDF document text
    • https://oasis-travel.ro/files/gosekuxale.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/wubuzenimajojugowuso.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/lepovigiwejubisovoxexura.pdfIn PDF document text
    • 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_off0000b1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D4 14120 bytes
SHA-256: 24f9bf4cfd97338567c5a93989e5a4daa2e3d37c5c367190994f0cb7ef4800ac
font_01_sfnt_off0000d50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 10680 bytes
SHA-256: 478ff1038ee7b798563bd3e0d50456a1f0ee6d124338685977b3b6f8cadccd4d

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