Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de179ba0708f0f3…

MALICIOUS

PDF

78.5 KB Created: 2021-09-07 01:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8fb4a37ae47f929810ce5d89fbff8153 SHA-1: 487c2c8edc75ffbccd264b8f5154b394e1da5b5c SHA-256: 5de179ba0708f0f36e1fe1035cb8747a14494e2e294c99da1afc8f3e2f23a637
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable domains, suggesting an attempt to lure users to malicious content or phishing sites. The presence of multiple links on compromised CMS uploads and disposable hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://kondicionery-lubertsy.ru/upload_picture/file/xalemiguwisal.pdf In PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/5647672264.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/27613506774.pdfIn PDF document text
    • https://alpinashop.bg/files/58765842581.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/b241502da2521d8fb8dbfa8f76ea22ab/16172534950.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/30140998258.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/66944897498.pdfIn PDF document text
    • https://davnosti.ru/upload/saxubepadomuxenabuz.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/99cb600d6083b157b57633e85119cafd/mamunodo.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/09e4523586df50398939ecfe222ed5a8/82261963238.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/85e05de6c8ac780087b3b07315be008e/94568995304.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/ada48aae23c3b292208591e2f4294499/dapewosidakek.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/vigd45rqhmq13g887jkl6gibdv/fubomevoponu.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dccabf04b2d---wiwilikegotifitikodowina.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/60176521717.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6bc41136a4---13731701454.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/tovoramelimijuso.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/roradumafasaponevewam.pdfIn PDF document text
    • http://hzqzg.com/d/files/98490280848.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/fanijaravav.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773ce0a49d6---xumimux.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b60d13bd42---15589711021.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/g41f3sfcoqrej4eumg6o7lmk0u/ritofugisivakaganusij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=anatomical+terminology+practice+worksheet+answersPDF 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_off0000cdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBA 17320 bytes
SHA-256: 1f62ef9bc8ff31c6db9007eca31aadcc8a0532ff20250311751ffa9c9fa9a2fb
font_01_sfnt_off0000fa34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA34 11096 bytes
SHA-256: ae306ae26cb07e5eb16aeab4bc47632937e660aec82066bfc03a3365bf6b5328
font_02_sfnt_off00011401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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