Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f92f435f82e629f…

MALICIOUS

PDF

92.3 KB Created: 2021-07-17 09:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 19d1620e00a37e6cc67e35fb50630c32 SHA-1: e05fb67da7d0af0859a9e5f6ef8a32029ee916fc SHA-256: 5f92f435f82e629f1fb41733556b8a73503502bd0e3783c8074cf901dc1f5c1b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081bfb62492c---womeruvojowi.pdf In PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b5e5d6960---nozejelowozifovenowa.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/laxazusagesep.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b09fa426e07---lamapisup.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72c16e5869---sibikifaxorakotubas.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16086707b08ab4---nefebugeze.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/nafixarojudamosu.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/cj90653786jmqscimrcm3r20nc/derotate.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/88757453483.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/bgqlt29r6ut0ne6bhesn7l7h96/9970871071.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/gezisobexupijebe.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/62593983098.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/djch24as2e2hnmfa7s880nokrr5enrgb/gilokovijotobofiliroj.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/nprljkg491e9c78ooqiv9l60rn/lagiwomisikowuzaxupekap.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/3s8l8kr09j8opsho6m4rhhm2tc/81307788867.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/fetojewepetozal.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/82823835939.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/phejc6m2fc9eqmu8b4da5enqlk/fazumudawepipemamemi.pdfIn PDF document text
    • http://gtshotel.it/images/file/nolug.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/28407089873.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c581f5dafd7---xenagunidululoxigutipazil.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/47312314486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=oxford+social+studies+book+for+class+5+notes+pdfPDF 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_off0001043b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043B 17412 bytes
SHA-256: 3827e7c68ff08a98bafe1681f845f9f8b9af5c9e8e6fa6c6bb187611ca3be22d
font_01_sfnt_off00013166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13166 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001497d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1497D 11204 bytes
SHA-256: 4d6f029556d74910a5d0885c8d62b64af217b478f3e06af4462335b093750d29

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