Malicious PDF — malware analysis report

Static analysis result for SHA-256 db12090587c6d6eb…

MALICIOUS

PDF

93.0 KB Created: 2021-07-30 11:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8be3b0504f260e18747fd126b7609333 SHA-1: 77362a4e8dfea11065bb27e0401c9d894d5e6cf8 SHA-256: db12090587c6d6ebe0092e28eb6005047f35ead56cadb0e81f08736f9f29ffe9
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable domains. This behavior is characteristic of a link farm designed to distribute malicious content or lead users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://budohurtsa.pl/userfiles/file/81454597032.pdf In PDF document text
    • https://khanikango.in/file/wamaxufuni.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/dugububupezepilopezem.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/16402794441.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/jegapodumopimosifol.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6f6f1576b---72952777935.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/721581066.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/386fa3a955a970177f09469fa03de683/werujimokixa.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/marokubuzapinigiwebinofaz.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/zozajitana.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/68v81qs1tkog7tjqf6o9jot393/zowibupewemiwusoziraban.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5b96613834295012d886e7cfe58fcd9e/73405780017.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/07adaa1e15bb00966b21131531dc35b9/vevezalogitenunil.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-7/20210507120034635152.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b85af7d384---59294958739.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/50695877905.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/45543345985.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/111f6e9335be2215f888f26345474957/fusukubufixakejif.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cadb22f2024---wakobuj.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/d3b71db64881d40397031c731bec918d/navivoferu.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/69138d3a38d1d2f5e5a64c8448a219a9/xigadefazozolenokerep.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/p4gmtkm4s5pt0uifhs07h0i6gp/98476480132.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/xiraxulij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=grand+theft+auto+vice+city+stories+psp+save+file+downloadPDF 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_off000101d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D0 18688 bytes
SHA-256: 3b57a93eb9c4d3d08b4b9153af42284998709849d186afb21cb908c5dd576d48
font_01_sfnt_off000131f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A08 11120 bytes
SHA-256: fd4635470c424976aa3baa2018a90cb0139f0189ea8e38ac0a0adf807f7a8096

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