Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f330ad38f10bf8…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 10:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4ee7b0b15f2286131406938ff824421e SHA-1: a01b94e4eb45b2e553ab28735dc574a1cc58e314 SHA-256: 92f330ad38f10bf8602790f1e7959adb6cc6f885b9fb174f48ab15d910275300
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's used to distribute further malicious content. The embedded URLs lead to various unknown PDF files hosted on potentially compromised or disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/aa38fb4365c1ee84565cedef7a23c7cb/vosopefa.pdf In PDF document text
    • https://fontaine-eva.fr/userfiles/files/fiwajuxemutuzava.pdfIn PDF document text
    • https://eklyps.net/images/file/59435098271.pdfIn PDF document text
    • http://icwest78.com/clients/67591/File/fitisi.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d93dbf15b---20607327277.pdfIn PDF document text
    • https://anakaygame.com/calisma2/files/uploads/81256941444.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e28b130c8f3---64355437523.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/75081174292.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/welavavemupumilodojon.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2e729e53c689d9b9ec54829aeae7d074/85309818546.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/16639995505.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/c2405b6dc8e08175333985e68ff1fff7/teturoripofit.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e35d37da8---nonisubewodevipebusuka.pdfIn PDF document text
    • https://orrizon.ru/images/file/68264181611.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/11161537013.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/47018791668.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d114b8e75---newubogosagabebekone.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/47749976089.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d9551dc7323---vezaladefutewotabufirovev.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adb5d94b6e9---64256492270.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079340706df1---90493504969.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/678699882.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/63222971825.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/xowalatasugazug.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/7361911888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=intraday+trading+analysisPDF 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_off0000e657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6E 10236 bytes
SHA-256: ccbd78953be34489a1649848b12033b2534a9b627d9c1400914af95c99e4c4fd
font_02_sfnt_off00011541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11541 17868 bytes
SHA-256: b48c72240571e832afe1590e1c7c1efc4337d8c8ba4f4a6943c71cc6955c3dba

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