Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9e3f6d7f233522…

MALICIOUS

PDF

84.4 KB Created: 2021-09-20 17:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 547e05e08bc3bf6db9826b5d0c323d76 SHA-1: 258728115b1c4e85942e00a071c3ee59ce9a2aba SHA-256: df9e3f6d7f2335225fe21517a5cc279b784605cc868f8a2ffb9dab2e6b7e0089
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple domains, including compromised WordPress sites and disposable hosting, suggesting a phishing or SEO poisoning campaign. The primary goal appears to be directing users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://insights3.com/wp-content/plugins/super-forms/uploads/php/files/413862bb886118c6c5a8406ab39cc97d/ralefudifaxepobupaxexi.pdf In PDF document text
    • https://4wheelchile.cl/admin/uploads/file/xaralon.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/leduw.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210917/file/fovasaworemumopi.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613795509163c---49075178469.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/kotozulolazutej.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a4259155e---mujivikijogoriru.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/xuzokobivekosumixobulo.pdfIn PDF document text
    • http://canadianrockies.info/files/file/21626868412.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/mitekasazepoxerenufavutem.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/fovefe.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/zodasisijew.pdfIn PDF document text
    • https://yuktogel.com/contents/files/58794682363.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/57837702713.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/tojojibemosolujexiletoken.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/xebebizazaxilamobewodazaj.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/siganotegov.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/80365784895.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/22024888474.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/filupirubisodujabap.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133d1dd7169d---553012637.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/tafefuzanukixixelogiberir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=best+naruto+live+wallpapers+iphonePDF 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_off0000e83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83F 16584 bytes
SHA-256: 24d0f73ce4d462a1549d2967a38835162ff96163760aeed0f2601203027fc7f9
font_01_sfnt_off00011382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11382 10652 bytes
SHA-256: f47e6a18478da6ac23bbef0ce7ac0ac9b328f1b99a5bccde88d53bcde683d41d
font_02_sfnt_off00012bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1