Malicious PDF — malware analysis report

Static analysis result for SHA-256 d418f31809d4fda3…

MALICIOUS

PDF

78.5 KB Created: 2021-09-20 22:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: db126d16e0a437f9f41b27d4a29d5378 SHA-1: be291f48f4becc0c5a4a1cd19d0348b3f65fb4ff SHA-256: d418f31809d4fda3a8c08ef7f7bd86870e619582db8af5c1bc1fcbfb57071e69
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous URLs, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://hugslock.com/app/webroot/img/files/mabamevawivaxofusiwowa.pdf In PDF document text
    • https://gujaratisamajparis.org/upload/files/9233011952.pdfIn PDF document text
    • http://ledins.lv/cms/file/foworewivifinedig.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/jiremu.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/lupaf.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/83327700596.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/3ef9edfbf59182bd2a4761bdcb8454ac/37719055714.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/tawodaxegirepaxozemuke.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141389aba4b0---sujulesug.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/fevuxapelebixemuj.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/58050767662.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/nulofaradalodimufagodiw.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/92137786681.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/90722646528.pdfIn PDF document text
    • https://swiz.eu/files/editor/17143065001.pdfIn PDF document text
    • http://wjcopy.com/upload/files/lujenopuregopugi.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210918094529.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/munifutunebalimojepanuwe.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/98271614128.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/ca320119c178590a14bfe7553f3c62eb/tukuzipoxixumilogazojavu.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfff1ea449---78687701404.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/desurixoxopatidevezubewif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=messenger+text+and+video+chat+for+free+facebook+downloadPDF 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_off0000d125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD125 11236 bytes
SHA-256: 99145315f592f2857454e6c382ceed9d7191ee0a7d06568888078a835e5c576e
font_01_sfnt_off0000eb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10360 15952 bytes
SHA-256: 9ffced387d9c623b883280dfa96773ba4fa8ce5f663821f73ae157c4e3275f3c

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