Malicious PDF — malware analysis report

Static analysis result for SHA-256 86de659194b1e16a…

MALICIOUS

PDF

93.8 KB Created: 2021-09-01 12:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ff97dc0f58fae1f5a7a7e120cfc95bd0 SHA-1: 81310ed4d5af35ec6e3c800259f576130b7cccab SHA-256: 86de659194b1e16a61eed7ed3111f7f17204e6ff80371eebe5d935256787c5d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised websites, likely intended to lure users into downloading further malware or submitting sensitive information. The presence of external URIs and link farm heuristics strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://ketchas.ru/uplcv?utm_term=why+do+we+study+history PDF link annotation
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/24011203619.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/34354066880.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e24b867e09---japavopaxojojutexunu.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dc4496a7fe8---74377742202.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9bee74c81---88960627743.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/bupizajiba.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/4igo011ufo441br9of5ij1de3b/kopusomiva.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/97127687753.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/zeritojojulisozogizu.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/kufuronokitopu.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/c33255c747bcf51a1ca5ac91d2a6ec8a/tenirububebimefokavuzunaw.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/lufadepaban.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ddf52dcf1---pomoxejedefip.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/50299775061.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/46074510449.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/figiriduwoxif.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/30833971630.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa3a8b6cd3---970481320.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca55cd9614---11950042708.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/rozepuzonagugulukon.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/limisudugojekilijitevag.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3098052304---gofutezugedisepatide.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/gudabokufopekuvag.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/xelarovelomamuximezed.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611b757e047ce---gesuju.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1611754a3d0927---1683792331.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_off00010b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12369 17476 bytes
SHA-256: 30ed715b75a448f444167f18a7c538f9c0b913624e291f5af364788c1bdcb85b
font_02_sfnt_off000150bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150BD 10328 bytes
SHA-256: 3dfb9c30461f693323275ed62c7676ac6ce57ec681fb494d9ee0d654c7c4501f

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