Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d1129bfad4dc791…

MALICIOUS

PDF

110.8 KB Created: 2021-07-25 18:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 965801464a57792cb83196630c6ce383 SHA-1: d94988871de4c9abe030c3361610e8c73e2eef16 SHA-256: 9d1129bfad4dc791c4f501de82c35ee7ce08dc5bce4051dc64d948beedb86c20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. These links likely serve as a link farm to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097f891d109b---texewoduvariroxip.pdf In PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3725ae29d---tubepudukedugapisokuzo.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/tubevejigabuzotaduvu.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/ee614d42384bdb0e966491667a670c3b/93783463461.pdfIn PDF document text
    • http://deryalvincotokurtarma.com/userfiles/file/23408218622.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cdae2d5de---52788423479.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/cdae32a4a3b56eaa62f8803eddb68328/97233986974.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5547f411a9---gekamasi.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/41029148645.pdfIn PDF document text
    • https://landbar.com/upload/files/57823226814.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160778e7ff00f1---68793380042.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/85977920004.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/dasatoguvexalezif.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/seragumiruzagagow.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/tamedojewofiwexixewexodud.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/suvenibawaxujijoxot.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e3397f1f739803c334e97a003b23a945/2215226278.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608082e26581e---12164986434.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e244b9dc54f92b083691301539739a63/fanobonusojulufifog.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e868e4403a---dogetawaletivozikexivopa.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/tabinivulubenawa.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/vufesewane.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc55f89b46---gimujaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=natural+remedies+encyclopediaPDF 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_off00014f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001676c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1676C 16992 bytes
SHA-256: 0290d40b5e08aeec51a49484a019b6ba23231edd9d333192316048e04d40aafa
font_02_sfnt_off000193ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193CE 10868 bytes
SHA-256: 4319e5900f850222d4aee8908682a197c6c6bdeb2557b2b67c43d4eb98f70191

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