Malicious PDF — malware analysis report

Static analysis result for SHA-256 0389b914d4f5eff3…

MALICIOUS

PDF

79.2 KB Created: 2021-09-02 04:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9e767cb0ba058318dd35d7b0b61cdfd7 SHA-1: b3cfb6bc6128a10f3596ad27e4d60733c777b8c8 SHA-256: 0389b914d4f5eff3f5e4be79f5863247661d52ca29570c57ffc679cd9a9c5934
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm, with several URLs pointing to compromised WordPress installations. The document body is unreadable, but the presence of numerous links suggests a phishing or redirection attempt to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3784935db---49029804976.pdf In PDF document text
    • https://photojet.bg/userfiles/file/xixobivarigu.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/71602887426.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/vemiwevasonobepixuwaku.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/70737234322.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1611713bbe8206---30323126351.pdfIn PDF document text
    • https://emmaushuis.org/pages/43727142609.pdfIn PDF document text
    • http://cycling-software.com/files/file/rerexug.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/29trqc8ctsnk6f611i2gpa2q12/fonulipuxijunowusejoj.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607616cbe04bc---18854615838.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/82885688965.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56d1230116---vokobolifuzifoge.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/pamizagotufejapeximas.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/zegawodejuteko.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/gefefojonusi.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160807d07c3e83---zinalopepor.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820d07ad2d2---dubanodosiweju.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/kvvf9ol7i360edtu0dulmqmj2a/jabavijopunegugasowelijuj.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/zojulebiriwonelibatazef.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/nixiwogisuwes.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/80808234433.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210725190140.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/48976885686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=escape+from+cannibal+farm+onlinePDF 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_off0000c9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D6 19800 bytes
SHA-256: b961a5839254b0e57b4c6d8b140bed835ccb3bb009f9b30ac19fc54f8f9d5c71
font_02_sfnt_off000114e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E0 10668 bytes
SHA-256: 5b25ddcb3ec63766ffeb1bb2b9f08b61075a1bb9870710f937f801d23a597b2d

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