Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84ca78eabaee8fe…

MALICIOUS

PDF

170.0 KB Created: 2021-07-03 00:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 51eb4ee4ee1fba4134040265add75d71 SHA-1: e0be7c61703ec30e6d9e9149dce65fe5c313e6a1 SHA-256: a84ca78eabaee8fe842ca00f39164426b222ca18df5033b2119aef496b345827
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised CMS platforms. The presence of embedded URLs and the PDF structure suggest it's designed to exploit users by leading them to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9229

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://oniceh.ru/uplcv?utm_term=child+and+adolescent+development+in+your+classroom+pdf+free PDF link annotation
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d40eec9f0f---gewufa.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607482ed9a6cf---vetajaligozelov.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/23525335339.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/54a43a2c504c9bfcd3540af99674f370/lenunavebuz.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbaba5c3ce8---weloluvefu.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/47406283255.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/06/files/210612110423.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/aa3030324b874ded286c355bc255f15e/wikisavoluveki.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b38b48abcc---53675207557.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/likafimavaloxovubaxuvi.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/06/20/pakebuj.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/phtj3hjj5md09g7v4e7f4qtsd3/labobub.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/kiroludilu.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/3fk6hl5b7a6hu3rr7bo5576895/45678209696.pdfIn PDF document text
    • http://placc.info/up_image/65224824617.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c5034197f---18356039285.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c88aeb25bf---jikoladuz.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/semonizesikafisi.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092eaad41945---fopipavazewibufanaz.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d34c62d6a6---67335658455.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9195a041e---34766199675.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cea7e0dd44d---28544690921.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083cca5ceead---98078974924.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/20539403715.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/rawis.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/106a7560a6811a89d241eecfc2c53b73/92506148824.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7t27vk6p9o5drisdhme2juhj32/wazojoridok.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002221c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2221C 17512 bytes
SHA-256: 3cb20c5f77a3e32b727240daad8ae07dc0dd07a36ac4c000b1de3a3a68c54b19
font_01_sfnt_off00024ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24FFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00026813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26813 11196 bytes
SHA-256: 073200dd58f49fa08a1dfd9d33bc6d58caa65a806f0c8b6d444d22bfd362b458
font_03_sfnt_off0002821b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2821B 16084 bytes
SHA-256: a79c9caf7d9fe7d7e6557dd08284a48a0650ee9668136fadcfdab94fba17ddb2

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