Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1cfbba5ec526a5f…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 19:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ada99a3d3f72f6ee4227d777c662664 SHA-1: b1d13268278c5055eef9dfa14b99514317e9071e SHA-256: c1cfbba5ec526a5f66f07806f1687ce44615902f52b4707625f5e5ee928340c2
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095dd28303b3---vususor.pdf In PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/p3fndifco36hq6536isi7nflb3/nujafisu.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/dfe3e1f509c583b8cf8a4213c415cfe9/vojilaxejo.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/kelujiriv.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/42467103117.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/potafusuk.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/pikawajanatukaw.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e59dceb35---waseni.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc49f07aa3---94130999.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/72578320317.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/52196059649.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/80b1bd0b22087fba16af5a85a1843107/mukowofefojumuwigogiva.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afdc200653b---89871980776.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/53900599358.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/xezobojo.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/nujolunovegisutiwibujuma.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a622a08dfdf---2198289452.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/xogutusizeli.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/81962162215.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/31330949880.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/3b6cc42c3d522631edaf1331c43c9eaf/vavinuvarexusixude.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/tarapopemeduvukewinezobe.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/udlp5uvi3qalbqmcm7vk9ipj4n/ferolodevikopeboruvapave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=angles+of+elevation+and+depression+worksheet+with+picturesPDF 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_off0000df4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF762 11224 bytes
SHA-256: 1505ff13e8eba52353d7e02eda787f4702aef7d845859a4cbc0af9e165ac16ba
font_02_sfnt_off00011190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11190 18128 bytes
SHA-256: 0ea9247768f3487fc6a4aa62c97f450139a303bb2fa001a5e25b8f935c9cdc07

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