Malicious PDF — malware analysis report

Static analysis result for SHA-256 359c59143a89340d…

MALICIOUS

PDF

84.0 KB Created: 2021-09-22 14:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f90d2da96d3ae85d27281bbf071183cf SHA-1: 71830c3c971c2d1f0f0584d1a3f018dba4a458a3 SHA-256: 359c59143a89340d128e1335aeb479d2996d2be5c3c6f1fe11b76af6d134a716
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which host other PDF files. This pattern is commonly used for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/nimizuzi.pdf In PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/xerafenojejek.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16131b9969cb2b---5503992277.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/tojuzebatifafefapozowuwi.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210908_8D4E2408F294AD73.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e77fd994cb4155431731240f42c3c96a/wipilefajijupew.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/kubawiz.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/3ee15d8b4cd118ff993289c54e27554a/nuruwoduparumixoba.pdfIn PDF document text
    • https://birotex.rs/images/files/43818688135.pdfIn PDF document text
    • https://adikkedua.com/contents/files/jojekineji.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/97391782283.pdfIn PDF document text
    • http://efeteknikyapi.com/userfiles/files/72114297660.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/tevipida.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/mulolobofo.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/i1o639g3lqflvn4csus6rlgsb4/lifonogavumodifolodaz.pdfIn PDF document text
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/23165083905.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/joxiwuwom.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/rapanarobezavopegixozogu.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/tejudimu.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109082330074409.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/zesapomekilizixop.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/5b216ca87673a584cc0c527a09995412/50997977902.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3d5a8bd8d---roditimaxazit.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210906_124743.pdfIn PDF document text
    • http://vaynhe.com/upload/files/wisigumiximusev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cubase+for+android+free+download+apkPDF 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_off0000deea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FC 19468 bytes
SHA-256: 3571090640bf5157201c9d10c8eb6a141031721c5f4447543e686c790ded846a
font_02_sfnt_off00012932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12932 10844 bytes
SHA-256: d42506705a21e7b68cf49d191a012b316892222bb479ee651acf2b2100b36bdf