Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b3301816532170b…

MALICIOUS

PDF

84.0 KB Created: 2021-10-09 14:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 458658edc5311f8621500f7105848ed2 SHA-1: 93a16734a1270535cc45ec6875fccb87917e9e28 SHA-256: 9b3301816532170b2eeee10d09a58866edf8c6634cb70597927ae9b7b755ceac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://telekommarketing.com/firme_data/files/vafovanagoluto.pdf In PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/18369780207.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/zalobavutotapalajojiv.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/16022967730.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/1319593131.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/b75b0897a056b0b0c1c6a8ab4e8e0a99/jubobebo.pdfIn PDF document text
    • http://minerva-collection.net/files/files/23377236687.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/vewujafuvemigiwijilabe.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/45078953714.pdfIn PDF document text
    • http://akademibt.com/resimler/files/gegolafanutakelibeximalo.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/kikegefizav.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109151303494359.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/da995dd26aba2d7c563d5cb936dfd17a/pojejabaweb.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109010538479140.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210911010223.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/14581998528.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/kifutunomilivulolepex.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/rejumupaxiwavazidavekoki.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20211001_904BFB26956FB194.pdfIn PDF document text
    • https://il-gusto.com/images/file/wenitu.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335d3031cf6---15300927840.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/dukadevaniweronoge.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/pelepafimeditijijejafiz.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16155e46e5fdf8---naxajerezuvupesiwil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=dr+fauci+thanksgivingPDF 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_off0000e44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44C 10576 bytes
SHA-256: a2cb04dae003015a280575787e80311b4a02dc4f597c9c87f8163547f7c89e96
font_01_sfnt_off0000fc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6F 17808 bytes
SHA-256: 927c38973cb84b7926e654e17e7cfe60a25dcbbc081ddde82cf8aded8ee02e0e
font_02_sfnt_off00012a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1