Malicious PDF — malware analysis report

Static analysis result for SHA-256 054bc6dd4eda18f5…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 14:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0da91f328fd14f04888dcabbcc7e205c SHA-1: 587c5ec39ec833d845634ba03a6af82fa0c6093e SHA-256: 054bc6dd4eda18f53315eb5ed685c298ac5d507545b5ddb388b84f5a13292479
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The document body was unreadable, but the presence of numerous unknown URLs supports the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614049335a7c3---gerosutejarave.pdf In PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131879449cd4---zimazobetagoxi.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210915210550.pdfIn PDF document text
    • http://lactopad.com/uploads/files/33580540535.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/lotulifizalevepagefesovin.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/98911723295.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/32067357821.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/lojowevu.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/luwosodujidib.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/69274874616.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/kozuforumupegabonuwuxor.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/laliguranugopefagamewe.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/79010855754.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf8d7079a3---52918650760.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/abd0d16d334a9a9b88925b2b847d10bd/7545716627.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/58272557668.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210910102220.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/jedozuxijogaluberowu.pdfIn PDF document text
    • https://pactforfamilies.org/ckfinder/userfiles/files/81090056970.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/dagoviwefarokiz.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210908_85FE2DF58AB570CD.pdfIn PDF document text
    • http://flomojapan.com/upload/files/fovixiwewodujadelika.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/o7omh5bb7vukn6k9f0tb1mpq54/zoteripizigixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=win7+sp1+isoPDF 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_off0000da46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA46 9804 bytes
SHA-256: d8bb1b699eb05bbc12a117ce4946e72788716378b395483433926cfb0d0c8003
font_01_sfnt_off0000efeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FD 18248 bytes
SHA-256: bb9b61df6306546b66adcb601bfa25bf24699496c1be94e05691671b4e6dc0e2

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