Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a5b9f9c7ea8c16…

MALICIOUS

PDF

87.9 KB Created: 2021-07-06 21:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ee31393f97fc036609833cbf774090c8 SHA-1: cd6656312e396bade6326070c9b570b1e82df6a9 SHA-256: 37a5b9f9c7ea8c16a9490f518caa88ee947925ac524504bcb7f9e9c03476557d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, likely a phishing or malware distribution lure. The embedded URLs and the nature of the heuristics strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://drafthe.ru/uplcv?utm_term=mass+percent+calculation+chemistry PDF link annotation
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/4rf36ovcj5idhnvifh5nspvk8i/44088220238.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/f1d057efc91586eb13eed075a628b1db/54374059209.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/zufedul.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/s0a97vfr3eouit6ir8fa0mmr65/73329906462.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95c9f30636---80581433922.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/puneremajazaxumiti.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/38657743392.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160762164931f6---zapikexinas.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/h2mc16m4nogs5i0bss6qcled63/kovovupunutofumetozasew.pdfIn PDF document text
    • http://fairmonteast1978.com/clients/71195/File/28344260380.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607781c34999d---podometukisunubokagerobi.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6d5538e32---55102125898.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/5658659257.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/40000036348.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/bopufenefusesejil.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdaf865416---kibidisolikun.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/86390564288.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/jefuwew.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/33283c4aacf9d1d3960bd5f146785393/felitevuludadafemapi.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/51357268265.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/wikexidedatifasozuwavusim.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/49826027442.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608102256de83---41781253151.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/00dac4f75b801adf6878e1cacbdf0e55/lizarekexakekasaxobax.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_off0000f17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17A 10848 bytes
SHA-256: 022caf8297c7113d380395258b47ed8da57b88fd409717e7dba2d8ff9c5421fc
font_01_sfnt_off00010a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A58 18140 bytes
SHA-256: be1059d9a39f07c39c57366e79929e8ea376c13a0ae77f8b866ee2adcfa160cb
font_02_sfnt_off00013a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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