Malicious PDF — malware analysis report

Static analysis result for SHA-256 b263e00f4c16bb99…

MALICIOUS

PDF

78.7 KB Created: 2021-09-07 22:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ee72a161be77edfb887d9ee9af134eb6 SHA-1: 09f7dcf2c5a2a0c8846a3ff9a61c4c5a7569b013 SHA-256: b263e00f4c16bb99fc8596e75d3723bb7b23eb0de9f84de29c00102260f6e3fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS platforms or appear to be disposable, suggesting an attempt to redirect users to malicious content. The primary attack pattern involves luring users through deceptive content to click on these links, likely leading to phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/50324000792.pdf In PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/b8c65c5a7729e017a1719bedc8484f96/funazore.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/79600377871.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-11/20210511222927730563.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e526d9c30c0---5798049770.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/43029439583.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/panofegewozasaga.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa5eb8e724---65644565364.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/93141407503.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160935b52b908b---bezazabenimodakofepitesi.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/m93ra52vcfnhmsvvonrc9fp69f/17984559201.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b982adc5530---51380616758.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/724caeb12da7a57c8211273265dc778f/51421399290.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/93174544416.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/87410127173.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/raxepefuroferuvelevopako.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/4dajdsc6l192tul029m8dbeelb/20593655631.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/20672241895.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/nenuwogogolesisonana.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079efc13692b---18293726073.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/pobasibanizorigoj.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/d215b49bb4e13eee92c8ddf820c659d6/ximejamopekasowib.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/094bf984d60f8053a32bf95cdbd554a1/80276009072.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/73441458225.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2npnto8uo0gmibe7kc9af91206/vinikesatuzajijixil.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f69c2c48386---fogisedukojapago.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/tibomev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=transformar+pdf+em+dwg+autocad+2018PDF 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_off0000cca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA6 17300 bytes
SHA-256: 54ffbf9b062eb8990c6f8b1d573a96010aed88eca6b778e7a83dd1b9a3f2d6fe
font_01_sfnt_off0000f94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94A 11476 bytes
SHA-256: b4f210316a08fe73115b79b881882a8ebc05eda1e4d7ff01051ac670fd329e9a
font_02_sfnt_off0001146d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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