Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3a24a9bcccedd3…

MALICIOUS

PDF

83.4 KB Created: 2021-09-03 05:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7f01e6e1af2c29a831ef3a340452f48e SHA-1: 87d80d7a42145460ea033de1c0e6f485fea9907b SHA-256: ad3a24a9bcccedd3491958822e1920b6ceb2f71c22cb3fc53612e6fb60620725
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious content. It functions as a link farm, with numerous embedded URLs pointing to compromised or disposable domains, suggesting an attempt to redirect users to phishing sites or download further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://anandtouristcorporation.com/uploads/zivamagokojotuda.pdf In PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/fc07a1d12f33a89e418124781bad7b63/losuputux.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/kapagimidematesevar.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/vogojafivu.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/wimenejufokum.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/55501d8f37ac9ffe62eef4efd6799320/55614067495.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/gupofukazujirusoginisika.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7ed11a6ff---24833505544.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/kixowaxokoxa.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/7503ef409440a6bf77c71174e3ff9f54/26224164376.pdfIn PDF document text
    • http://wfuchiomega.com/clients/4/46/46a815049f9cfb11ab63b386d19cdfb8/File/73486936571.pdfIn PDF document text
    • http://tipresentoio.it/images/file/4806391374.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/64657650008.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/1e7b58b651ff6bdc2d7bb4d144be140a/bagutodatuduseviwevipawiz.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/7117c5ff1cf818b496eadfac98cd137e/81874482780.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/70138066516.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/limubixipi.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/u0uua5drur4slfh2vs9slr13d3/55440061158.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/sapugefujevuluzoz.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48960bce49---tebefulegosuxelilejugupit.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/suxexizezozomotil.pdfIn PDF document text
    • https://avela.md/userfiles/file/migojalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=philips+aquatouch+shaver+user+manualPDF 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_off0000e02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02E 10952 bytes
SHA-256: f7c96d9e66fe1c72ea9052a8f4ea036931ef7d69bc10e53704b11e36b3a29ea2
font_01_sfnt_off0000f968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001117a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117A 18116 bytes
SHA-256: b7abfdab1f92de0884ab8faab9d69e6c1c48eb641fba8e75d101d0ac300c4b7e

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