Malicious PDF — malware analysis report

Static analysis result for SHA-256 3254d528b31cb72f…

MALICIOUS

PDF

93.2 KB Created: 2021-08-19 12:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28c04a54c9630fa4cacc8dd7a6d8a75b SHA-1: 2c8472f89cc8123f917c178acefe77f172e9595b SHA-256: 3254d528b31cb72feba1cc530b47040b40f07d1f6852515b8085f3267362c3a6
156 Risk Score

Malware Insights

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

This PDF file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to direct users to malicious content. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://ldbell1965.net/clients/85689/File/jomararawibalizem.pdf
    • http://wjvanderheidedienstverlening.nl/uploads/file/kotebutaji.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/cd21c3cb2549dcc53a80577fc1c698d4/rekelijorilapunesinox.pdf
    • http://allprintusa.com/admin/images/file/mobixosi.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a005a7e2917---78737957333.pdf
    • http://synthecinter.com/userfiles/files/zajinuvufotopuvesosanebet.pdf
    • http://a1-automotivegroup.com/upload/files/6429236403.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d2171689873---3361746301.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2511bde13---zizegufivipetukifesawit.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cf946255c---kogebibivarawuvupodu.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/841685b7f1ccdb3133ed2a510ea73753/nenuner.pdf
    • http://timeyear-v.com/userfiles/file/zezedofonizojewumelep.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc62ea7b2ab---minisa.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607116611bb5b---gokenesabilavalagakolexu.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070422e5c814---nitoluzaxokajiwew.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/79fccf6803d246e2a85576c6bffe0943/zirijozejigonipomixil.pdf
    • https://conexusinternational.com/ckfinder/userfiles/file/51286973563.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607267ec04dbb---4932713216.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/05bd7c2596df71acd3fca7b2c0a2bb7a/gubafovovagamugojume.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16087572d446b6---wokemugukifigewoxufezeze.pdf
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/bedodifinagigopuzibedog.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/9mfdj5bjsi71hounkuicrnfr8c/38236082808.pdf
    • http://huefpdf.org/upload/file/67978349983.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=9.s%C4%B1n%C4%B1f+edebiyat+s%C3%B6z+sanatlar%C4%B1+test+pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010497.bin
0cb2332db2b735c99514e5ac9e1dd7f30e48352bb280624918f2afa2cef5db77
pdf-font-stream PDF embedded font (sfnt) at offset 0x10497 11084 bytes
font_01_sfnt_off00011e36.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E36 16792 bytes
font_02_sfnt_off00013648.bin
19158a4c4344953c1623fdca4256d58307209621fde0c32f17731d82f6f242c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13648 19020 bytes