Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb41256d6936e49…

MALICIOUS

PDF

105.7 KB Created: 2021-07-02 23:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b37787fbc712aecd2f8ab9870f74953 SHA-1: a06c11268a304e0e63dc3d365aadbb1940e48eac SHA-256: 1fb41256d6936e496413629adc2348765c31127f2858f053acd0f15b6ed7f7c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, functioning as a link farm. The primary purpose appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074135e3cd76---gogapifevibazevobejamefuj.pdf
    • https://jairdefreitas.com/ckfinder/userfiles/files/davedediguzomujofuj.pdf
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/4635906593.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad4afa9092---kexizurunofuzunosinugomab.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/odul4g36jpn5ihbn8ifej06rc2/lenoliridadarutanoke.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6b7f0a161---13968121979.pdf
    • http://akicgiyim.com/userfiles/file/duvuguzagiseza.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160923fb3ebeb5---37332222236.pdf
    • http://www.bash.cl/media/file/95986164873.pdf
    • https://tangentemag.com/img/file/99480929986.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09f87c5271---90978701074.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/e2f8dac33d11f42553f932ae5f8e5644/39236078665.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/82bg6cibbinp2092bknv22ilsh/6018282127.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa971a4143---zivimuwewutuseziga.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a75d839802---98980191991.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160824c1d0b35e---kefejotonulilu.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6dc339101---walatezasanorefis.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/ofjhm2shc37dam2q613nh6r1e1/mevizakomulopug.pdf
    • http://southport1969.com/clients/861680/File/xuxitu.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/75e52e895850e09216b8f7d2d1e669a5/89837291583.pdf
    • http://efuegypt.org/userfiles/file/37429130970.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160ad99539460f---62290643597.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cpl+course+test+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001290c.bin
73f1068d7e8d09e87abfdb9418b9372d81c580442f636f7b29939738a6aedceb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1290C 18064 bytes
font_01_sfnt_off00015803.bin
217555d51920598e45c23fcec45eedf99d175925c23b769c82b2ee8d9a85f852		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15803 10492 bytes
font_02_sfnt_off00017019.bin
cb64f7f10201c046d3ab53afc9a78d156e2f7e61896754cdfaa7740083c72343		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17019 4164 bytes
font_03_sfnt_off00017fbe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17FBE 16792 bytes

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