Malicious PDF — malware analysis report

Static analysis result for SHA-256 0836bffaf3a81e27…

MALICIOUS

PDF

79.1 KB Created: 2021-09-20 12:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 52c47ee64bb4411a1c1ad587d60fba4d SHA-1: b1b59ec7199584ba6493d0f2019f77ee8c0d2534 SHA-256: 0836bffaf3a81e27a97dfe54f733692cc26a8a82bb3f1b340751ae67f051e55b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV confirming it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection mechanism. The document body is unreadable binary data, indicating it is not a standard document but likely contains embedded exploits or malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://allprintusa.com/admin/images/file/7341763324.pdf In PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142325f764db---gafokuder.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/pibalezogir.pdfIn PDF document text
    • http://kustari.net/userfiles/file/xofivo.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147e2c9a471a---72337972638.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/k892s4i5khoki1pti8cncpf182/bejabukozapulanode.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/gilerenat.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/zigilozakurezulirabek.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367e51a5e25---19787994578.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/36618621002.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210911005013.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/gepasulerejuwatumimazavit.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/75140964361.pdfIn PDF document text
    • http://abnicum.com/files/file/62130550775.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/60839364980.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/soduwemuzizavidiw.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/gekij.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/nulilebukuzujut.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/90980879530.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/54573794629.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/wutijobudogabo.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9c345ef26---tipororuvofiwuwesalut.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/24293211980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=benefits+of+ict+in+learningPDF 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_off0000d36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7D 16596 bytes
SHA-256: c04c1f0a440a5d85c6e978bba973be96ba81c1d5c3f8e80c08a4a80aea0ef7d5
font_02_sfnt_off00011660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11660 10564 bytes
SHA-256: 6782935d467f0e66fb263445883f290f9e60966b642b71cbf6f7569b9d7a9995

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