Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a110891039a67c4…

MALICIOUS

PDF

76.6 KB Created: 2021-06-30 01:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 92a294c438767a06526634810dfd5b83 SHA-1: dd815cb0835c2f4e4fa92eefc403cde7bf026b8c SHA-256: 9a110891039a67c41e75fccc98b2668b16114cbb724763b94599faa87e37bea3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/c1f324dd3b70d5f17278fb144d84b0d3/nevaj.pdf In PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/pc15nf7ujebrbtga7ma5v33csn/zonefasezesatezenoge.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/99005609772.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8b3e86f23---xoxupofoxajim.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/totiguriwovixedovuf.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d116f3e7a---22366072856.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/j1ftua5f61tnkvs4o2f21qn20i/90402411170.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f23413c5ea---wemedowonesatesexetezuxa.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59d0ad07da---mowaki.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/bapuju.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160750e033f0db---99782086005.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/427b2ae4d379cd97ed8a195e78423c38/34404997442.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/ginoloza.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/deabb801470217f0610f7a14aed873c3/17555091609.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/008fcb26754a9c1ae0f1d55c45c88d7b/pivubulabiduvoxekomovojok.pdfIn PDF document text
    • http://getem.eu/files/file/limetel.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/70046230272.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16070475b88351---84408835293.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9f56cac1b---80493908596.pdfIn PDF document text
    • https://rajaunited.com/contents//files/xumakux.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/6fc422c4758b7b6464df2446b176639d/7870457871.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/fawekuzulezupajomalivadi.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/8bb86ef3c52c4a4a9db4a9aa8eaef29f/1254911343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ovarian+cancer+and+weight+gainPDF 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_off0000cdbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBC 10492 bytes
SHA-256: b75d146fc9136016d40a33525b68105bb44b44080d8d8f0b31edba92e094e93e
font_01_sfnt_off0000e56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56A 15480 bytes
SHA-256: e4282eacb4b42fedf73da2bdfe2d75d3f15355335e0e8c89491ff868d4bbdeaf
font_02_sfnt_off00010d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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