Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd11cbd34e40b7d…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 14:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 791322ebd6da2d49197c5436920796f0 SHA-1: 448ef3f875274754efde27e52370450ed216e295 SHA-256: fdd11cbd34e40b7d11b4706443b13d3501de379cd3659194b55c9fe6d9ec5891
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple embedded URLs and the 'link farm' heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613493ff45aa1---nojaxobufu.pdf In PDF document text
    • http://sushigonewildtogo.com/uploads/files/nobirepimu.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/muvapo.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/zotozasevi.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142bbcd1c810---duxuzap.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/keniz.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/tisubesosegegofege.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/5792095095.pdfIn PDF document text
    • http://dentistturkey.com/image/files/vusimuvoxal.pdfIn PDF document text
    • http://ahknchem.com/upload/files/80633082734.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/wuladevija.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/gogumofifu.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/25359301373.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614884f0199bc---79804371125.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/tixomolimilopuzatu.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/72129943818.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/76301995537.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/3542816320.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/93772894160.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614834b2ed013---38467573292.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613fceb38dddd---86309750621.pdfIn PDF document text
    • http://methese.com/upload/files/94891229486.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/samoxowiwukiz.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/20895016172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=flutter+ios+developmentPDF 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_off0000b394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB394 10536 bytes
SHA-256: 6a067f2f69c3538f8e64c7c8191cc97d07c8e500cc91e9547d93e2387d2e95ab
font_01_sfnt_off0000cb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB84 15120 bytes
SHA-256: 17c7e29ce9e7aa5d7a9e9f77bcedf999814281a64fdfa954efe5b77b2e528a00
font_02_sfnt_off0000f1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1