Malicious PDF — malware analysis report

Static analysis result for SHA-256 2748a9ae64721f23…

MALICIOUS

PDF

85.3 KB Created: 2021-09-09 21:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c5b89b25b58b01fe3949ea8a20e4d578 SHA-1: 2878b3e60effb3debdf15a6636c77b496bb00773 SHA-256: 2748a9ae64721f233b87f886caf7f6c8cecb3aa912a8fef65990da187d2c9c25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links, including one with a 'warship battle mod apk' term, suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://vet-spb.com/userfiles/file/42860625394.pdf In PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/61324464798.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/77312746713.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/1b1cb0826ef7cc9cdc98353a7761a7cb/1492193465.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/80850246199.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/sonarifexulopuviliro.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/lulasirazugufanaxewus.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/lugawovubijefegi.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/11037068984.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/ralopewujefowix.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/tawuburawokojojob.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/4425848358.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210906_45284FA52E62B1A3.pdfIn PDF document text
    • http://industra.sk/userfiles/file/mosafemaberiz.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/webarulomepigunafikam.pdfIn PDF document text
    • http://dfanchem.com/upload/files/63138555125.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/51713224241.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/c29c5f66fcd56c72a8a26abda90bed83/72947604577.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/nuporubutasexefekubejuwem.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/54167361478.pdfIn PDF document text
    • https://posh.hr/files/48512521001.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/78430285607.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/13363297121.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/pftm43tfdtf4887o471rsnhn66/32170334783.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92470321369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=warship+battle+mod+apk+all+ships+unlockedPDF 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_off0000e60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60C 11104 bytes
SHA-256: 9f925afdc11d9366285d2edd7dc970de8124691db8dbe032e7bb1b3af2bef735
font_01_sfnt_off0000ff87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF87 18168 bytes
SHA-256: 697da135d93d3779e5253bbb9bb5daa380459bf852b2e6c2cc97ed18a52f31ca
font_02_sfnt_off00012efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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