Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f3b51cd0f7a7ba…

MALICIOUS

PDF

86.8 KB Created: 2021-09-02 08:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8b32bde16e505a3ec73f5cc1de1937ba SHA-1: 027cef40e030c7597c678a55ccaf1814c5295184 SHA-256: 86f3b51cd0f7a7baad3f2ffdb1eca232e5175d81b0f7da6a4d8c21f85523310b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e528d2c97d---7638525183.pdf In PDF document text
    • https://turbooto.vn/upload/files/37643202458.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/rigotebasedosikaxubomev.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160739f23d14f3---sotevupifam.pdfIn PDF document text
    • http://fini.hu/userfiles/file/wejidiforuxikawerutu.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/65900594189.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210710112502.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/21691691088.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/lezudupokebodukewusa.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/sikelidomumawumominat.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086203c9dae2---juxafuwugigulejotafa.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/19607033889.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210813183309.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608923d36bf0d---fakuxuxazinesazojawupolol.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/mukizejet.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be31cc483a1---63455143625.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/48620287380.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/aa31ad2043b402f978ead5ebe4c3981c/40990023745.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/64818404600.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/rirakevupewisobanuwini.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/3rok2efl4v30ir8f8mheolrrcu/95430782611.pdfIn PDF document text
    • https://fratellifurloni.it/file/gadojosutuvomusakudofoxo.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210901223224.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/39278274668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=abstract+concepts+examplesPDF 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_off0000f166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF166 10668 bytes
SHA-256: 7796dc8aff6f2aa147a22f7c578c91cf07c36710e95defecd99ebc5a23de75ae
font_01_sfnt_off000109b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B8 17252 bytes
SHA-256: f9b6815287100bb24d40366169e3d8c0d320dfaf09d153111ec53311314852dd
font_02_sfnt_off00013599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1