Malicious PDF — malware analysis report

Static analysis result for SHA-256 64bb188bc88bf2a8…

MALICIOUS

PDF

77.3 KB Created: 2021-09-17 23:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 729fc2043de8db708b5a4d096d0563c8 SHA-1: c80edd95647ee255fdd1705f92cbaf46f0568a4e SHA-256: 64bb188bc88bf2a8017e9e0a75bf413a3491673d92d8ae5ff9910bf21643b398
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://gamepinleri.com/calisma2/files/uploads/4556515238.pdf In PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361e122a9c1---rumoxorupejixa.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/bufinozije.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/fa900d9243a7156fb38abfdcc2bed3cb/bofaxixomidodaserugegiw.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/85777363894.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/kofotosonedab.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/puvugusaguge.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/kovojokenit.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16132607cef38f---bemiwi.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/revit.pdfIn PDF document text
    • https://robertbah.si/files/file/18149915462.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ce8b09dba112aaeb32e4179716fe3e18/72226816187.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161416e61610e8---59402090579.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109071813139093.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/16789518257.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/0c920ce41dc579be6210f57c031ff533/jafokabovegaralodikusi.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/jevukulinosasonopolaja.pdfIn PDF document text
    • http://cpils.com/userfiles/file/pikuxafezakutukevaki.pdfIn PDF document text
    • http://kechengchem.com/upload/files/votopeg.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/94445379191.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/79664490475.pdfIn PDF document text
    • http://lagrupacio.cat/file/nivuweborewaxobukur.pdfIn PDF document text
    • http://chinalabware.net/d/files/53554750435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ps4+stream+androidPDF 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_off0000c8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10A 18400 bytes
SHA-256: 434551c8e5df4cab0861fca26c74c9dbdb9a3f68199b8a197984041d2425f16d
font_02_sfnt_off00011093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11093 10444 bytes
SHA-256: b72fc157c40972638c2adfceaf586136e7fb1bebd9dbca675bbbefce06e27364

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