Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa61caa938db5fda…

MALICIOUS

PDF

80.1 KB Created: 2021-08-17 11:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fa7b97901264b3cd81a45586d3fa91ca SHA-1: 1f8e520598b067d92f470772553be9062ddf4b46 SHA-256: fa61caa938db5fda8bfb89cffb38318c359f7ce09c78cd3b9409522e5764d17c
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. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this document is designed to redirect users to potentially harmful sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://ketchas.ru/uplcv?utm_term=tabla+peri%C3%B3dica+actualizada+2020+pdf PDF link annotation
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07a8b8d242---begixamuvovufabotoseto.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/lenovedosotanuripa.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210802_49C2088619BD3023.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/e952c2d030e732a6e9023a2dfbddf815/74353979404.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8c7781acb---26963869276.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/raxojesilabafalofezo.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210606161224.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160989bbc14847---15349184943.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/61923489204.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/jijotifolimu.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/53743850995.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/felusakodogelojanofilibem.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/zipulosogonuvubilisuji.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/c0a0bc60308231ad85473d59a260c478/jojomabamigenetijinifok.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098760f2ef34---vopep.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4280268322---boretuzafaxuzipekigas.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/kerumepananigobojevonu.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/bc35b53b6ed891edd623e6401fb0d201/wogojosil.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/5282585425.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/gopajodogututotalo.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/f48614d16f18a201d151f9e95150e7fd/pewegon.pdfIn PDF document text
    • http://wheatland1971.com/clients/25033/File/31599360066.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/24a358d43a804da73079862705afe86c/zasonotarufipuxemezonalav.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210605_010503_7104.pdfIn PDF document text
    • 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_off0000cf9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9C 18256 bytes
SHA-256: d64f256695d0f1b7330e9b177f10f3ce693d5cce375693943f5764ac250eb8b7
font_01_sfnt_off0000fed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED4 10864 bytes
SHA-256: 3bb149eb3b9e1459ca01e079a2680e2e0ab7536957ad75b2990753b985d5f445
font_02_sfnt_off000117f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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