Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90c91a7c7d91a89…

MALICIOUS

PDF

80.3 KB Created: 2021-09-21 02:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e29cb9c994f7bed6f66fa37c24372fad SHA-1: c941028a7905037dd41966c3be8c91be3d7a7597 SHA-256: d90c91a7c7d91a89422b5125117eb613435b9ab3b637a1a705f1ff4e88903982
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS upload storage, suggesting it's designed to redirect users to malicious sites. The presence of multiple unknown URLs further supports this, likely serving as a distribution point for phishing or malware. No scripts were extracted, but the overall structure points to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161474260e7832---8352883945.pdf In PDF document text
    • http://kurier48.pl/files/userfiles/file/21232349345.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c21b840be8---povorigarilur.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/mojita.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210906150934.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/5tmf2hhk0amnhj5efso9cutigv/kubobepi.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/mozad.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/jibivakametot.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/10578220422.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021091919262_943020955.pdfIn PDF document text
    • https://tepihtrava.rs/files/donaga.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/17282763780.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/bowirobebaja.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/77815bbd94ca62060cc8149608a2af54/59506228048.pdfIn PDF document text
    • https://henuopack.com/d/files/93856769334.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/fikerixoxojuvirutuba.pdfIn PDF document text
    • https://tarsiman.ee/files/file/romugaromowogotezitoseg.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/dilezu.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/tozubonikiveg.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210919_CCADABC17A5FBF0F.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/nivud.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/gisanasog.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/39918713311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=badminton+league+game+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_off0000cfa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA6 10560 bytes
SHA-256: a77912ed3ffb131a28ba1289b507a7a16e250afd849fecb2a0cc6c37913f2e7c
font_01_sfnt_off0000e787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE787 20360 bytes
SHA-256: b0804ddfb76fa6967f3c5ed85604a98a24d64883f770c436cc1cb844396224a8
font_02_sfnt_off00011bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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