Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf6b54a214d7e49…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 22:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 184281ca40c80fa3aff104473e966dd1 SHA-1: 7921dc6b9e30ef7972199759f54628c302836fa8 SHA-256: 4cf6b54a214d7e497588406953fec550e52f218d9401339590ad6ca9f141c686
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to malicious external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://coretry.ru/uplcv?utm_term=play+chess+on+android PDF link annotation
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/71481721460.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/tudirizimefiwuxizojuwaza.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/73055610608.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/1b189d76abc3cb7115a4e5ef959cf03b/zozevepuvanilozuposejabej.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/zozeborisalijomagowelo.pdfIn PDF document text
    • https://viceda.com/userfiles/file/kejoronope.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/zepajutupexize.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/85de7aba75c36a8dd4f67c808b9bf9b6/73653039734.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/wulexidijabixo.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/74751168513.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/bivobudugafezoteguko.pdfIn PDF document text
    • http://crediramasrl.it/public/file/68579657774.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/71693351694.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/9220957943.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/fubepulegapebagadezo.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/86994436284.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/waropuzakapisububurur.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/wukedu.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/xoxemesexodejusowewasozeg.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba28d873ed---simufadadezegizisasaxo.pdfIn PDF document text
    • http://vandofigueiredo.com/userfiles/file///denigumilibiv.pdfIn PDF document text
    • http://carbonelite.ru/file/nizatidewipobe.pdfIn PDF document text
    • https://ksboutlet.com/file/files/pufizifujaxuzekawimos.pdfIn PDF document text
    • https://mattress-leader.com/media/94701797390.pdfIn PDF document text
    • http://fpole.ru/sadm_files/87075884134.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/73215437007.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB58 16796 bytes
SHA-256: 0bcb7937926133e830fb4224e1fbb803ed5b4c4aa19367c17c2b4852cff38fb7
font_01_sfnt_off00010708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1F 10484 bytes
SHA-256: 8226c2b70fe5ec7165ba1b9af7d05d3d350829905d9eebdeae9ac3ba2ff5c091

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