Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef4eb6eb7895f01…

MALICIOUS

PDF

83.3 KB Created: 2021-10-07 11:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 32cf61dcde2d5b243977ce51a61a0877 SHA-1: 6e14a562918def95318d2ee7b4eef70b66febc84 SHA-256: 1ef4eb6eb7895f01e064c107adc80e2e2e62e3559ca9845233a75955340a7a13
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or directing users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM further support this, identifying the document's purpose as a deceptive link collection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chrisdepanneservices.com/Sites/cds/files/dogoxusiwovofapilimonus.pdf In PDF document text
    • http://flexinform.com/hirlevel/file/1085082352.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/15716462317.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/rizigarumibidokiputi.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/radarifebelatikujivu.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161526f0cefa45---besawevokun.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/87187955957.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed1aaf15f7---78006240526.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/86205717054.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b4267d4de7---suzidofikij.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/d5ce1666c32bd881db32e85d2d94695c/36602401266.pdfIn PDF document text
    • http://bienbao.org/uploads/files/62783162123.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210908192235.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8343ce172---lovovivusut.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/borupakipakodolixezor.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/48205578488.pdfIn PDF document text
    • http://dalaichau.com/files/74742215394.pdfIn PDF document text
    • http://stringladies.cz/userfiles/nekuzowarapupezipu.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad31b863e5---niluvosagubenuteboravik.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/nudiwat.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/60379231704.pdfIn PDF document text
    • http://tradotel-riviera.com/file/68845266016.pdfIn PDF document text
    • http://kvrhousing.com/uploads/90156000230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=1+third+divided+by+4PDF 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_off0000dda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA9 19324 bytes
SHA-256: 1efd5a11b1178d5cd95f099737aa3e14e8e2894c33e0452f5929c35d2c8d91b5
font_01_sfnt_off00010fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DB 10096 bytes
SHA-256: 66a2f7f5d180ba7a810488ce5963a38c4d8e6cf451fb59efe2aee0e134ed6bdb

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