Malicious PDF — malware analysis report

Static analysis result for SHA-256 f072e13cc437e193…

MALICIOUS

PDF

76.2 KB Created: 2021-06-13 09:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 16f1e35dcd59d9e9ea305c6faf28b8ba SHA-1: fc3edd2549cc99e49a5021d21b7ccff11a0238ca SHA-256: f072e13cc437e1935d81ebaf3aa397d28e98f9d70549fdb520b43c19da41ded3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains embedded links that point to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The 'SE_CLICKFIX' heuristic indicates social engineering tactics designed to trick users into executing commands, likely to download and run a second-stage payload. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://infrive.ru/uplcv?utm_term=what+is+driver_irql_not_less_or_equal PDF link annotation
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/8eac9b8fe138fe89106c6125c65c94e6/17021175938.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/ddbd2bd01546cedbf206c7fac801ea85/votizusula.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a9679aae0---xejuvesomolil.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/df5bb980b57475ad18c76ae494a1dcad/49620284974.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4561c6e6b1---resejuw.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160708f546bc1c---4229965939.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/vs5s79i0d4prhp34ugs1lqb3io/92499654198.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/1f3c871779e841bb2fc983c0f99a3b15/93479854096.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/vowagobumejajatutumafe.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/nomufegamosotejozaro.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071aa51f3fcf---sumuvawezixawizewesezuna.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/83815055635.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/81409337318.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e379855dc---laboxosakokit.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/bva2fiutvrljjmko7a9bmfegoa/luratuxo.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/335752af65af28d6aac476649ec720a9/wowiximali.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/93248395751.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC62 5140 bytes
SHA-256: 6acaf803c23ee5f06414a387d4ac675848febf68fe87056a4f6ebfa291ee2b25
font_01_sfnt_off0000fdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF0 10836 bytes
SHA-256: 297ce3f411d929529daa51a1a796374290a6661fdf0591551e23ed8a7caa4e11

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