Malicious PDF — malware analysis report

Static analysis result for SHA-256 45860df59fd4625b…

MALICIOUS

PDF

86.1 KB Created: 2021-09-08 08:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b2b80a5beee05ffab752224c3d680c44 SHA-1: e84963d586264b02659c8334878ae0b8a5d11281 SHA-256: 45860df59fd4625b9dc1ab449c5531892897f6db23d73a78dd5c5697c4d1e924
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML_NYX_PDF_MALICIOUS heuristic and the PDF_SEO_DISPOSABLE_LINK_FARM rule strongly indicate a phishing or malware distribution attempt.

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 http://doo-san.com/userfiles/file/20210522203444.pdf In PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/d3c13e66e9bb728692a42381266047d0/judurazatiti.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609857495dd6b---lapefekezibuvatapeg.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/76a4c529b06c4eda8b6762e8f4aba4eb/pupenoxaxufikopeferiv.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/1135912210610a8bff26714.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160adf036d3b8a---dumijoromikuzesumufed.pdfIn PDF document text
    • https://badoza.net/userfiles/file/sixetoxesopovitiruketel.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608354328446d---26308263623.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/gaxefogumevigiguwefo.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/ledukedufikeme.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/838840604.pdfIn PDF document text
    • http://zuche0551.com/upload/file/kupidexibunib.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/90933707292.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/bdfa642a54b538d3b1d80f4fe8877365/87185744079.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/43e502d2526db88898404cc74e06acc0/63425471550.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/57288057088.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cb422d2a9---kazisene.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/xixizi.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/dikizovibutatebop.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/94o9m46seeocrskk71npebv16u/98586948434.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4f7b0dec1---94375363139.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/70099178573.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/jigivitulezimipov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=app+that+reads+pdf+out+loud+androidPDF 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_off0000ed82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED82 10676 bytes
SHA-256: 8ec8afce86836dd006049676af01c3261fb45aa2fca66b14d68cf47c49ab7455
font_01_sfnt_off000105f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F1 17456 bytes
SHA-256: 2f2fc87d7612d1bce70a46c1c4ed4aee71923bc7910f50ff63d40c1fa85d299a
font_02_sfnt_off000132da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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