Malicious PDF — malware analysis report

Static analysis result for SHA-256 12dcb1ef6e5b0ae9…

MALICIOUS

PDF

74.6 KB Created: 2021-09-08 21:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d0425058019a29cf9f532c2b3f9d4dcc SHA-1: a1142263a8c8880703b0a4bfd14de3fdbd7a4def SHA-256: 12dcb1ef6e5b0ae9826a2fb3bbec69e07db3af32318aca34dcf0901e9dbe7602
156 Risk Score

Malware Insights

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

The PDF 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 potentially compromised or disposable hosting sites. The presence of numerous embedded URLs, many pointing to file upload directories on various domains, strongly suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://wsm.hk/images/uploadfiles/file/sijugufelugediruluw.pdf In PDF document text
    • http://ewtch.com/upload/files/jojupokuzunodunujulokav.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135fca7b6cc2---doruzujironotovikuzavufil.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/54710034731.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/33379280850.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/dd555049196153d86337f6b05a8edecd/ketexow.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/fepimopelij.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/42281079359.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/53652377860.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/5e037aeca859dccfa02d7ca22cd7110e/81974795123.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f47832eb68---83958116938.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f6ccbaec7---fifozukevolavit.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/41012333740.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/mitojazonosofajod.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/mopapo.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/69476543037.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/xizebevusiwudokenomixe.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16138ba26863fc---30143384304.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/87566089169.pdfIn PDF document text
    • http://timebymtm.com/upload/files/sodaradabagedisitewege.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/11692518980.pdfIn PDF document text
    • https://unosms.us/userfiles/file/digozilizuviwanopuvu.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136091e12807---rolumeluxadoxofalosin.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/wevivotumelexorebiz.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/fopagowupawilefezebifuri.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/bepisuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=investigacion+de+operaciones+pdf+tahaPDF 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_off0000bcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB2 18348 bytes
SHA-256: ff3362e73cd13589ca98259ea7b2ccc00617ad096157e1a7ef19d343e834e05a
font_01_sfnt_off0000eba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA4 10872 bytes
SHA-256: 1c572d7a7d8c12914b38172963d73bc3458c6f3608f7a790ad802576a8e19575
font_02_sfnt_off0001048e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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