Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf3d602f557c66d…

MALICIOUS

PDF

93.4 KB Created: 2021-08-10 02:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 385d7bfd91edee48b3295cdcd0d6b722 SHA-1: c56bf7116c175195533383521d2e38e5f68c0a68 SHA-256: dcf3d602f557c66d0dc56c6d3ea06ce128f2d0393e199f15f6a46db5d7126f8f
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 and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://wastran.ru/uplcv?utm_term=coffee+shop+business+plan+pdf+sample PDF link annotation
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c0fa7c94---tarufubikekawasidu.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c3095c39ad8---bepuguwezew.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/widubeme.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/notif.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/1e211064fad819e862b0673c11de0fe4/kunepuniru.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/44622075092.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/a8b1a6a336b7729157b62d28547a4aea/manirowujomaxidananokug.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/kepozegotazizazozako.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6a65148f1---85993009834.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/kuxila.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3b2aa6891---89569169221.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/40327868079.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609914b038d5a---zezitudagira.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/giweguvuwizujexa.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/53926744634.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/85899777989.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/75170760339.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608229aabcea0---zoripi.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/bc97e4dc266d4699ccf8922972f6a7d3/rivoluwanon.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021081005570173499.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/dubabaxunit.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160d2421cf0e68---13642556919.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/jvci2ao1hqna25s7r37g3vqub3/falovasanudataferenaneze.pdfIn PDF document text
    • https://arerp.kr/data/file///lizujajuzelorisawe.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_off00010b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7E 16668 bytes
SHA-256: 47609d65ff1d91a9328aa0cad2d267daa1c2570716115cecd5a7730bad761e57
font_01_sfnt_off000136b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED0 10836 bytes
SHA-256: 67ef72b576900953621d33d04bd3360bda88b3425d51ce7d863298dbeb6ab6ae