Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c74b9a71d31662…

MALICIOUS

PDF

83.5 KB Created: 2021-09-05 08:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2bd0a8de53c2b12f43b25fc9c3464fd3 SHA-1: 29cc49ccebfa2da970398b4b14e0ff1ffac72877 SHA-256: 83c74b9a71d316625e8148858aa93bd94ee6a1d0002082e569584da3ce57a910
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content. The file's structure and the presence of multiple external URIs indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://catamma.ru/uplcv?utm_term=ikigai+pdf+t%C3%BCrk%C3%A7e PDF link annotation
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a58af35ca---zoxuz.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/ce1c9a9be62927aa9a9ad6ec0968f1a3/lapales.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/gowitosoxajowidigesifu.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/62722029340.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16129bb960e39c---zipimidi.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/6a34517d7e4d79d34da75517c41cbb04/40679233229.pdfIn PDF document text
    • http://redactron.com/userfiles/file/59912585014.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/jaziwowexawidogemawe.pdfIn PDF document text
    • http://nsureunion.com/clients/71556/File/71398126938.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874a0291b1e---vajipijuniduxo.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/53235ecd236d8dbde1697b4113c00957/dupuvuruxuwekav.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/acfdg058ad3r4sk1uqojht9hab/jafamaruwabukibupafal.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/kasux.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/74685367723.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/q9m8j2vps2859ct4vk7munkg01/bumodinogomixo.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/eghpu2k9kceuac8eu44c4r58q6/82936515889.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/hgr9fpi5ft0dtsjfnf770m7a29/nosamamunezitunov.pdfIn PDF document text
    • http://www.ghidmariaj.ro/app/webroot/files/ckfinder/userfiles/files/21908373154.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/8i3e5a13una185sprfkfnnnra2/foselalose.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/7003e951ba5a46dcfb3d6b1c8aefc993/83637113821.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/66726691565.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/a01b04c5d0cdabf6b0ad5ea52ed46944/dukabebuni.pdfIn PDF document text
    • 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_off0000e012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE012 18740 bytes
SHA-256: 7bd93b6f931cce91a6b141a926a0d155701ac69c960a40ad56def2d814907a03
font_01_sfnt_off00010e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6A 10668 bytes
SHA-256: 4d23ad870f7a4e47e8423200eadd1d8fa873cd57cf0eea3018caec180e62f857
font_02_sfnt_off000126b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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