Malicious PDF — malware analysis report

Static analysis result for SHA-256 f681903350529e3d…

MALICIOUS

PDF

107.8 KB Created: 2021-07-14 10:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d3c650c8c7c0fdb7f994884b6e31eaa3 SHA-1: 2ff97ac3b576e08e3c0dd656a3b13bd44da2e88e SHA-256: f681903350529e3df14887b8feca1e8822b425d09e34945c5a09b610e507c189
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a586ec2ce---33534141821.pdf In PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160be3a8a0c085---zivasogedowarugane.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099069a00048---tidepezemurijanu.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cb6f15441---vekefukubajevijonederar.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077da8f47484---15965974723.pdfIn PDF document text
    • https://dm288.com/slicice/file/rezeza.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be487b38707---13798899663.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/tenenimesufexak.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f704dff68---jefazixinosufuvo.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/zuparo.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/69991530327.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/f1a4hi4g2u77836nrccqe35gof/12809620592.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089a433162f1---22673462544.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/hnkfirqjs5qq5d0tjp100f1c90/85119631357.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/87061183543.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/sufodeza.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/55610700682.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/zovegeraboxafipalozofeki.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/80534634826.pdfIn PDF document text
    • http://podushka.by/files/files/rokisugewukar.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c89bfb535d4---56952592880.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/xabufeposofewe.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/mujimidipaluvexepir.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/setovemaxineb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=lesson+4+homework+practice+scale+drawings+answer+keyPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12056 21092 bytes
SHA-256: c3e24de0f49f511704b5c6d92deacf4f408354ae98f85fef949e817de75cbcb3
font_01_sfnt_off00015813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15813 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17020 6576 bytes
SHA-256: 3fb715c8e6390c58e6b5a281a70bf9e35a44b1b76b0ef8c97251ef9fd6f71b6b
font_03_sfnt_off00018700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18700 11288 bytes
SHA-256: ccd89810e922b581579f481cebb0d2b11d2f97a5176a1de54e9d4c04207125e6

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