Malicious PDF — malware analysis report

Static analysis result for SHA-256 4caa514d482d8054…

MALICIOUS

PDF

77.8 KB Created: 2021-07-16 06:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6622ce63a0bcd9d6c02504e00a334bf2 SHA-1: 5b3c0727bab9c66ba7ad3bb6989d1a6b12f83e55 SHA-256: 4caa514d482d8054a9faafaac8cf8c18594c9b0c0e883bc69bcd6010554d03b9
176 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. Heuristics reveal it contains numerous links to compromised CMS upload directories and disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. The presence of external URIs and links to potentially compromised WordPress uploads points towards an attempt to exploit vulnerabilities or deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/m8r1k8eglps9ihrm0121vh5jm2/wosoxivotijuv.pdf In PDF document text
    • http://growourworld.com/clients/83159/File/xasekuvasudovu.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/4ai0qtk309e68m10bgkmhpc539/64457567470.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c707eadea---20808451880.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/lutatemerunetesiwotamul.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/43ecb19d76b79aed27963a50a240c732/kekinedizadopusepix.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/pipaxu.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/gitavotinesuni.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/13377476398.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/11559243025.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608104aadf555---88437927246.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/dizojeromi.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fc3a78eb9---woxuxe.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/ggh6lop1bj5ck3g0nipughvpa3/3307729403.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/digigarebajuxen.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/3602957636.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53eb5402d7---83983401743.pdfPDF link annotation
    • http://ciskmv.com/css/file/90427418929.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160728ab186439---74626833480.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607479c447340---74687735684.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210706090600.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/kuresitemofefokoge.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/tanenuna.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d07f2563fff---tokojidowexagifinadiwi.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/87nlonctv3mqdohqnqs6h5lbek/sesujapedimunabosovobuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=hrs+type+1PDF link annotation
    • 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_off0000d02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE842 9880 bytes
SHA-256: cb16947fe89b40439ddd2a743d13e28064a0016d59f6c7556745382f52980d7e
font_02_sfnt_off0000fe2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2E 17020 bytes
SHA-256: c34b80baa117b9a385208cfe23cc9e40fd672767b9cb21627d8406c31a14721d

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