Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f18cf184c41f28c…

MALICIOUS

PDF

76.9 KB Created: 2021-09-04 14:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 901754fb289c1f0b79887422fbe5e238 SHA-1: c6fcff8850506be11de0f613cddffb48d704e431 SHA-256: 6f18cf184c41f28c096bed19a53cafcef8450f549347a2a94fee951520421e8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=clock+spring+repair+manual PDF link annotation
    • http://aksaaydinlatma.com/img/editor/image/file/1094405860.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/zopumutuwanezulota.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/9088b5108dc6dc7453285f86e5da725a/15893398279.pdfIn PDF document text
    • http://abnicum.com/files/file/rozugetanir.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607183978a41e---fexodenexamefufebexera.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/rajofifiretajixejol.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wafipikawijogupoperak.pdfIn PDF document text
    • https://foulardfotografando.it/file/25189776633.pdfIn PDF document text
    • http://3sdent.com/upload/files/97140976958.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d8ab410b3---dazixitolaxakekum.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/e81jlbl809iti8f1efvat183gq/64757174503.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/88156217332.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f24607b346---tugufaruxizisexasetel.pdfIn PDF document text
    • https://kaimano.it/file/mejiwegusona.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c874e32355b---xugebuviwojofobobarimos.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/bolaxotopokemenuxup.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/78042030829.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/96311363530.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/38804076717.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5ba9edf98f18e75020a079dfabc5b03c/baziregodaruvosipo.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/16186811987.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/tifujokabusidedebikerelek.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/rk0nvktv3pn1n0h2cj5d1d2643/rorovojuxevamogabir.pdfIn PDF document text
    • https://mmszke.hu/files/file/nuzugojimoro.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/pugufapuxilijavefex.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/lepetutedawifadevafibi.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_off0000ca0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0B 10840 bytes
SHA-256: abb6fc985a425337ccc3e79f0871aae63957f0db7415901eac0a060bbd284c92
font_01_sfnt_off0000e308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE308 16744 bytes
SHA-256: 1d76c3fad5acd651801b4863c65cef750220700a3af0c45ce8cca498a4eae212
font_02_sfnt_off00010e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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