Malicious PDF — malware analysis report

Static analysis result for SHA-256 4416fc4b5095995c…

MALICIOUS

PDF

85.7 KB Created: 2021-10-16 09:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 57118e6e5f4500bd9295654f6856bdc8 SHA-1: 688198f0dae093b09669c188eb2dc26d005983a2 SHA-256: 4416fc4b5095995ce115c6027b50eeb8de68140009b0a0673a692cdee3d29a5a
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads and disposable hosting. The primary attack pattern involves luring users to these external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cbdc.co/uploads/ckfinder/userfiles/files/gibawimotewabipusaju.pdf In PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/dedoritof.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/41164440467.pdfIn PDF document text
    • http://ban-dong-ban-mat.theonejsc.com/userfiles/file/88066082358.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136a9731e58a---78772000891.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/kenikin.pdfIn PDF document text
    • http://chromavials.com/d/files/jopetijuvawegapupajemuxu.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/veruvupibiradiratufonex.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/nugonabalomifiv.pdfIn PDF document text
    • https://topupdana.com/contents/files/famonekojefal.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/81545391180.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/tuseravuxigapojuxer.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/23607998366.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/95187166826.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/a588fff8e36494c31ef6d15bf5124239/soludegoloragirela.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/3336823868.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/jefabozuxevedero.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/66812522343.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/59920536853.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/d6a0cb128ce50f3910483da33148b4a1/34712483922.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/nigowodosenatikobipoga.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/80280018782.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a9dc006555---19256153910.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/daxegekipizunuziwiru.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/oscUj7J0Gjw/uplcv?utm_term=types+of+contractions+in+labourPDF 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_off0000e927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE927 18340 bytes
SHA-256: 883789e4580004c48f2ae6762bd690d722ba83acb1488cb37ba4cdfd1494606c
font_01_sfnt_off000117ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AB 10792 bytes
SHA-256: 11f660e7a06894e770dd1ee42261523991b36e35c616d1c7ed9caa8d3188e9c3
font_02_sfnt_off00013082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13082 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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