Malicious PDF — malware analysis report

Static analysis result for SHA-256 85742de246f55ea8…

MALICIOUS

PDF

125.0 KB Created: 2021-07-02 22:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2ff0543b9cbf330e56863a3ffead3660 SHA-1: ef742ae4e81a5f811cb31cd5671564c622e04305 SHA-256: 85742de246f55ea8a0ddd21f03ae16503193c7c02d09416b8dac614f2f80b9d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external URIs, many pointing to compromised WordPress sites acting as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9758

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=meaning+of+chainsmoker PDF link annotation
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/xiturokuloleniro.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4d8e907c7---52848795393.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/wipemujufe.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/2qt6hg80va3lgmbt42ute09fss/6904768336.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160af99c124735---lukomoxega.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99f1b22eef---zowupuletawegetoxejose.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16089e601af384---3428911686.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/39812080856.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/846ff0f982c48eba4f39d200b65e1669/60574554709.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ecd27c637---13366160342.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/ronemusagixawadam.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/wegowimoviwupamizuxa.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608d96d3cc712---64641260679.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d48934e39---50870487972.pdfIn PDF document text
    • http://hillandcunnreunion.com/clients/864369/File/1294201648.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fde24765b---vanakiram.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/68170604911.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7d76aeeec---59475051147.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/71306066297.pdfIn PDF document text
    • https://wsbtitan.com/images/file/62958063248.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/11053080065.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c18a235790---xukaxuvujoson.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b8f454d95---lofagexovutewawiruvopupi.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/16822921809.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/takiralosubomigepadarum.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082d6b11d117---20490475086.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001b7b9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1B7B9 25732 bytes
SHA-256: 43193a63621a036bfe7b976f209537609f2d6f4dba5751c71e18337cee1ccb63
font_00_sfnt_off000156e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EF9 10724 bytes
SHA-256: b83b72acc692d50c2fb7510e129adcb57e5ebd77e6f4c1547c81dfaff075cb69
font_02_sfnt_off0001875e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1875E 18908 bytes
SHA-256: aa3609b2089cdf948c55c0fc3c55617ec38e48875ba18185be936247edbc42a8

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