Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d12abb8d0df94bb…

MALICIOUS

PDF

87.2 KB Created: 2021-09-05 19:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e7dda313bb8e158aacd62eb1e1054d5 SHA-1: 17012e5d5c0d42f17dde445aa31a216da9759a5e SHA-256: 4d12abb8d0df94bbac577160166cf563b4628b571e87a028b691fffc8c36b535
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristic firings point towards the document acting as a lure to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://laborke.ru/uplcv?utm_term=performance+appraisal+pdf+notes PDF link annotation
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/447d534a1ec7bf79bbcb741013e9813e/lujatepowazimuxitelekotef.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607667b299eae---tiwubejajiniv.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/bbd9310a824b4ee2971a6065aa5e3ddb/7576752392.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0578712001620429141.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/fobenetegofukegara.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/8424e726dde666a3ddac89a728058cc8/43249507808.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/9557846047.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/e6816d2f55678a335018096888088d05/23599376063.pdfIn PDF document text
    • http://candientushinko.com/images/file/lupubulomiginixejaxori.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/goliwitatubobedopejus.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/77702611644.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/91597793322.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/veveza.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/45a63949e162f66081b407aa3a8889b5/23405885415.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/wutagowasiv.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607252df47221---44697850441.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/nitujume.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/60027573391.pdfIn PDF document text
    • https://amblamy.ee/upload/file/pupawanixakerusagizunufes.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e88f9cea2c6cef06a95e4a2a30cb4808/gesotewotewerozegaxil.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e98358e5f38---53348030945.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/8460714074.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/7rtlbckneume2evu6pd9ahf4i5/pobidi.pdfIn PDF document text
    • 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_off0000ed53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 19616 bytes
SHA-256: 2865fe05db00d30083e894d3e00c33e8d3df965d5f8e972505c64ec7a27df38a
font_01_sfnt_off00011e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E91 10780 bytes
SHA-256: b9ab49d93a8c73f4a1d969b5da4ed5ef8072b788a7b32c3471db54115e5de07d
font_02_sfnt_off0001375f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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