Malicious PDF — malware analysis report

Static analysis result for SHA-256 4665679bf00ccf41…

MALICIOUS

PDF

91.0 KB Created: 2021-09-07 22:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8bd300dff4fb983dd9f45d42e7d32b66 SHA-1: 6ab3a8526b01e103f72c1da0cca793e70f44a047 SHA-256: 4665679bf00ccf410c4a5125c33c6e3b991a63908ad0529c706e3beddc0e6cb9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of these links indicates an attempt to redirect the user to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://irlanc.ru/uplcv?utm_term=radical+candor+kim+scott+pdf PDF link annotation
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/bgdjg5ujv8ujip4bcff70hb3p7/62490178952.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/39948805118.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ad147510b2e---87052063628.pdfIn PDF document text
    • http://augsburger-dartliga.de/uploads/file/zobojukiguxuziviz.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/45163692568.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/0f4buqonfgj9e2ppl9qg7hf8g4/towotagexa.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/28828255419.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/22885678938.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/14663662363.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16087daa746492---61429813921.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/8728ae237a7baa589cc9caebf99f7305/sugividazovonojini.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f94fd0a290---46523023616.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722e6207f34---54902505782.pdfIn PDF document text
    • http://s-box.eu/upload/datoteke/sowami.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/fozikagaw.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/ab0db58e5630a7ba22cc244577a279f0/wuwurivaro.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/80050144524.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/6550498f5d14f8867645094d437f8214/2093368095.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/rexotusufebulekulebuwutub.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e53776945---gerisuronizamopekagemobe.pdfIn PDF document text
    • http://atek-ent.com/upload/file/gopipadaxanopa.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce78e7aaeb8---bodijedojejanazek.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f7fa18be4f7---bonakefobomanurikowinired.pdfIn PDF document text
    • http://gyobel.itpublic/file/fitevutedis.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_off0000ff7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11790 17812 bytes
SHA-256: da0d4b9bf857d16dee043d6111060e921be8fd478cf2cff6c74482b1672957cf
font_02_sfnt_off000145d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D6 10784 bytes
SHA-256: 2c05b599338414f072b9f6f35e4bd3613017c96fa7458b9f2e0587db8d46fe6d

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