Malicious PDF — malware analysis report

Static analysis result for SHA-256 43106390cb8e7292…

MALICIOUS

PDF

71.8 KB Created: 2021-09-05 23:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 511039322e370db6e0fa3deebfa21138 SHA-1: 2d4159d2ee91d3408e2eae4bcbb48ca07f4fa5bd SHA-256: 43106390cb8e7292cd5b6d1f86b7e04978ac1faadd76b4bb199be27e5bce8c8a
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to malicious or compromised websites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://ozdermusavirlik.net/userfiles/file/puwiwiga.pdf In PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161035d4f65e8d---kukiwemuwabizetujemobogil.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/24480890098.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/49127291888.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bbd126e76---61129184389.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/bomukilopabetaxanomin.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/9997a3ec9b6f776aff99eafd978d38c9/58130236865.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/jedapikuninomelofule.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/xubuki.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c8957f19e42---89701313969.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75112869ff---54327305171.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/vazefijiraneluxunejo.pdfIn PDF document text
    • http://fitviewer.biz/files/file/kisisizitefumixareb.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/42747131967.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/tovun.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/kipamewetu.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e2818237d---rubumobebutuz.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/hbjmn8dqv7sofihqknl2t4cvk3/motazufizavipiwetapa.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc9e08c964---fumewipe.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/livujowivejumi.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/sqs9v92s1ge5g5dctcq23031gd/5412989881.pdfIn PDF document text
    • http://wych123.com/upload/files/73069966227.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fe294617239---domokajizifiradolojitu.pdfIn PDF document text
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/20239890603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=haier+tv+model+40d3505+manualPDF 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_off0000b6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F7 16488 bytes
SHA-256: 4a32a0ff8f3682f9ca4424f346f6db7e064fb715575d5204263e1db2448e9152
font_01_sfnt_off0000e06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF882 10904 bytes
SHA-256: 97155f636929cd86ea383ba554a00755ee2208fe85d44cfec804d8689c1f3c66

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