Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a66f9b60d66a6b…

MALICIOUS

PDF

94.4 KB Created: 2021-08-09 15:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 39ed0fcf4038d590ecb6c73d9e8132c7 SHA-1: b5975ead24c93229d8c41eb2a7668b50b358ee57 SHA-256: 41a66f9b60d66a6b2d32e37dd2e4b7c89af827b3d3b0aebf55fc0f30d7a45ccc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself appears to be a link farm, designed to redirect users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://garglob.ru/uplcv?utm_term=how+to+remove+dolby+atmos+on+android PDF link annotation
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/57e9ccc1b6d3c2d6a154c2bb7116273d/90570418040.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/zotatuwolo.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/79161045669.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/tuvewarebizetawab.pdfIn PDF document text
    • http://e-hane.com/files/84769799409.pdfIn PDF document text
    • https://datajournonepal.org/files/59340259028.pdfIn PDF document text
    • https://rasorestefano.it/file/bugame.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/41805326466.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0598797001621477873.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a1750bda4---49695678329.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5c2a4d7dc---49146390144.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/d4e3882e12c93170e499192e53f2744e/lapakoli.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e3b01b966272c1753309448e0dfe89a5/71464477299.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/90976735461.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/vorojoxerukunib.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/zikafu.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/67329272013.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/jcnduig1nbs11q43aae6jtn5f5/8826303925.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-7-28/20210728081320808774.pdfIn PDF document text
    • http://goref.ru/files/file/68232518908.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/nuzavitaworar.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a99e92f7babcc4f6c99ed30c837e2dad/65914974384.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084e3b99a8c4---93047698770.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_off00010ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD1 18252 bytes
SHA-256: 9b8e44cd1f1d3d3676d1e98589f29a0987e2355844bd7faca5f9f3cd70b98ac6
font_01_sfnt_off000139b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B8 10808 bytes
SHA-256: e8db311357b2837000843606c9677d2e6790f4ef61dccab313f565f87339f65b
font_02_sfnt_off000152a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.