Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6faad9b048ec97…

MALICIOUS

PDF

84.8 KB Created: 2021-09-20 00:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 70a59cf57db9838672735b333ba8619b SHA-1: 2a3544a82cc5cfb6b89a0cb02b7e923abafe2317 SHA-256: 5a6faad9b048ec97d69b489ee1e77f2570a5f70abc4a37e3bfc66177009cd2dc
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'ClickFix' heuristic suggests social engineering to trick the user into executing commands, likely to download and execute a second-stage payload from one of the numerous embedded URLs. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of many links and the 'update drivers' UTM term strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=update+drivers+windows+10+automatically PDF link annotation
    • http://csc0512.com/userfiles/file/20210920052839_i1gwms.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/dexujasu.pdfIn PDF document text
    • http://geodez.com/pliki/file/vipabazowowuz.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/dapiguguzabatedabewadusaw.pdfIn PDF document text
    • http://palami.by/images/file/wononetexuvededo.pdfIn PDF document text
    • http://hotechike.com/files/files/xikerexajobimusi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311fc0eac98---razubak.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a694c2d907---59578256746.pdfIn PDF document text
    • http://creationart.hu/files/file/vodefifasujatil.pdfIn PDF document text
    • http://artepcb.com/upload/files/51825925057.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612ea99fb27e7---rojuwuwumukekufevipu.pdfIn PDF document text
    • http://volamthienha.top/userfiles/file/54346504246.pdfIn PDF document text
    • https://masukpt1.com/contents/files/7192370837.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/jatemusemevugiderewoki.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/317953e55ef703cfdb849101c4abb02e/rekaboxaronovadogewa.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/59587788833.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec32ed2e60---13277158702.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/patapetuvoxuwiluparowu.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/nizidupexefovaduludaxa.pdfIn PDF document text
    • http://abwessex.com/uploads/files/labajolozaxivusugu.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/74114558500.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/48fdc7ce4184abdffe349056af4b6dbe/posotejonorijelovukulanom.pdfIn PDF document text
    • http://hongdacable.com/d/files/7813191346.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/33469401638.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210908_422D0B59144D22B3.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_off0000e45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC70 17932 bytes
SHA-256: 39af1a3a4368b4e8e1239fb51d3535cc9e72c64ccdddef88d2d1799e1c3e90aa
font_02_sfnt_off00012a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A72 11224 bytes
SHA-256: 97b5ba03df4d6665c6fcf2c212824c4ae007095a5f26a09b7899454c14c665fa

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