Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a5f46aebc51aa4…

MALICIOUS

PDF

72.8 KB Created: 2021-09-04 15:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 87d274d952f93e4012470f396ba47191 SHA-1: 787c0e9590610cb2fca5cfe97299a53a717ac7a0 SHA-256: c6a5f46aebc51aa4d3d58fb4db7a15a5126452aba72fbf2f7914fb026e233671
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, indicating it functions as a link farm. Heuristics suggest these links are used for SEO manipulation and potentially lead to compromised WordPress sites. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://archism.ru/uplcv?utm_term=muscle+%26+fitness+book+pdf PDF link annotation
    • http://crm333.com/documentos/file/6228118245.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/24134854291.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607797a43b5ad---buwodi.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/81264778325.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/4fefc279538332fa7b8be295a592168f/begorugirelukekelu.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/15746916555.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/nigojixamibeda.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/46647740517.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/8314429749.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/fibotukepikireliwidedetux.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/xuvigilexe.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/ecb7381129cca4330523787e90f7a0b3/18747878556.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ru7cgfh1947a4116k8crkk15tq/fitidinuravuvefi.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606ee55b52e8a---7799365714.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/72520417552.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/sh5qjf7aum8r121p97tupqtrc6/motonusasikum.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/juleperuburowovalarijado.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/6711962383.pdfIn PDF document text
    • http://grotech.in/userfiles/file/vibak.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/91481667817.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/ee3f0cc31ac8965b07d61118c553f2d5/13436107296.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/unhuc94ucv750h9kdp7ifadub4/jalixepejarabezenejaniju.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a16cdb02ce3---belijenaveruzivusugide.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_off0000bed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED1 9632 bytes
SHA-256: 7bd4fd1e9491cc35f9737b934a53f6ba9844fb9cad7bad08bddcaf8543563b99
font_01_sfnt_off0000d3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE7 16492 bytes
SHA-256: 0bf09440812f201366deb434f2e4200ac931f493a1b2941259b2d6f7f747dd3f