Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc8ace3787f4f25…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 15:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e63abeecd45aaf1f2b3ce88515950084 SHA-1: ad55a07d030feb7c6a47078635a613a73aa88663 SHA-256: 9dc8ace3787f4f25aee742b27e553f43f66fd0d5f0b085dce99fbb178343e207
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://garglob.ru/uplcv?utm_term=rules+for+writers+7th+edition+pdf PDF link annotation
    • http://corporatiegids.nl/uploads/files/51922148526.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/lufomoxozawoka.pdfIn PDF document text
    • http://rld-carbon.com/file/wopaparekeze.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/tasijosabitofilofebaran.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/fededase.pdfIn PDF document text
    • http://royalgroup.at/tmp/sujofolemomifimin.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/67602436971.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/66165325065.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/4368293707.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/bodotipogafixexifir.pdfIn PDF document text
    • http://inercial.es/uploads/files/kanoforalivuz.pdfIn PDF document text
    • https://upaspor.com/resimler/files/tadozaboxagilememurejin.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/20955370721.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/muxinanizugojajuse.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/37007812560.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/43846610770.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/97961358471.pdfIn PDF document text
    • http://4tyres.nl/public/files/jowekurebarelokelutot.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/90273007859.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/wogokanoritaz.pdfIn PDF document text
    • http://jinyezi.cn/upload/gomivojalidiwasopi.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140cb9e8155a---letajesikijo.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/83679163407.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a9efc38fc4c5c77091e36d45f176b108/51219160687.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bef3c3e9a---22730431277.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/wevaxodurikilolakavago.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_off0000d426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD426 10716 bytes
SHA-256: 024673db4a4d0bc765092bd5b163c57ea659ddcd7a4e460a6a7c52b10a9a2c34
font_01_sfnt_off0000ecc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC9 17456 bytes
SHA-256: e44f25e893e7583618a14167b2d78db439c2c3357a252fab00d68ad1ee40196d
font_02_sfnt_off00011a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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