Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef2665a646732a8…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 15:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cb85a45e1d1df5d4a47d6e5daeefbd1e SHA-1: 3c141fea21eb488156911f8e10339c3378b53e05 SHA-256: cef2665a646732a8d7a0576c4405bef17357bbd227977078dec863b2cd65cd13
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e976a35dc8---jasokurip.pdf In PDF document text
    • http://envisystem.com/upload/userfile/files/78013700884.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/9551561970.pdfIn PDF document text
    • http://northcity.rs/slike/files/8410317348.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/10170194148.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/kau4qgh659m939go58ap0nohb0/movaxujeratok.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142400949099---duveritajimesumo.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/vebeguvotisanefelojide.pdfIn PDF document text
    • http://industrialdevices.in/uploads/kubokomozisarofig.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/12837517678.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/53297391391.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/36809254843.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/49250693664.pdfIn PDF document text
    • https://okazionche.com/files/59277974997.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/4316577619.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/kaparavosunowafagoneve.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/xatutunivebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=speed+vpn+premium+apk+free+downloadPDF 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_off0000da3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3E 18104 bytes
SHA-256: afb30459ece7bcad752e99d5185dba6f7ad52b3ad2c59f1e4a9e25d633055bef
font_01_sfnt_off0001092b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092B 10812 bytes
SHA-256: c358bd1149cd303a7453362b5c764100a04e12537752a1cf492d873b5b6d3b7e
font_02_sfnt_off0001221e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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