Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d30d6615c1ec4f…

MALICIOUS

PDF

98.3 KB Created: 2021-07-29 20:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5f030b2701ef4df416ff23570fd6e351 SHA-1: 8e2ac0a5c3eeb6b76386845115f591d357b9ad2c SHA-256: 99d30d6615c1ec4f38e304cfb26729434e74fe049011354f5f16200806c6bc33
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress installations and disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The document body is unreadable, but the heuristic firings clearly indicate the file's purpose is to redirect users to external, potentially harmful, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://pixomot.ru/uplcv?utm_term=how+to+barrier+nurse PDF link annotation
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/wavaroxepukomekaxob.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae014dd2cc1---nepatavamenolidu.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfe6bb3424---jetibesusiwetunija.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/pimumo.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/42097938501.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160900d86044fc---12821754418.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/muxubaba.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/210621220855149698x9pa8.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/fojivexojixi.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/nopisowafewazuzenexoduvar.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/pogawokatexan.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210603_213558BA07D09E3B.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/v5n521tggpt80l9okvdupnqqas/rixajapezuvezemapabevi.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/crs5v0kca9rnv7d6n6heirrc74/39145384737.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/66611813493.pdfIn PDF document text
    • http://nature-revive.org/files/file/zovewizusirakeririgoni.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adaeb406ad7.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/0e621ef93ac094eebf274fa82ef28533/31575796959.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/teguwusopumenezowalonaso.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/jebikowivibaru.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78240e8c75---48980474775.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/kajujinegowebagazeboro.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_off000120b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000138c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C2 16972 bytes
SHA-256: 2d8306cd050696be15841eb8128374228683785e877e1340b86739b6bb489afd
font_02_sfnt_off000164d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164D2 10372 bytes
SHA-256: 1b39fe6348e79c7848696c32f199b5f828a7e01f1de242db29e12c80a08549c5

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