Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb386d3c981e98b…

MALICIOUS

PDF

88.1 KB Created: 2021-07-15 22:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc59e6d6377866455b6b8da15ea33739 SHA-1: 3a00494f8a40145ee3da15c9cf0267e8c8303098 SHA-256: 7fb386d3c981e98b8426b2a9e6579da5e4f91481629b9bd7080bcfce0e700391
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The document's structure and the nature of the URLs indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://huntic.ru/uplcv?utm_term=basic+c%2B%2B+questions+and+answers
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/mnnqvqi9ub53ue36hnmfokkj8r/woditawipelevod.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/t4dqmdbkoilfvmg5hdjjpavsfp/zifixipifetalaja.pdf
    • http://utuin.net/files/fckeditor/file/20449750711.pdf
    • http://www.euro-fly.eu/userfiles/files/18201676264.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/7ac7bf8a559bae81712ff8818300c86c/patifabokuxuw.pdf
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/suzopudiselowowazabumo.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb2aa747d2---xubumifi.pdf
    • http://agisma.ru/files/pages/files/33474017055.pdf
    • https://yuanfuconstruction.com/ckfinder/upload/files/masemawabodevajefibada.pdf
    • https://nsck-cykelmotion.dk/userfiles/file/24701542173.pdf
    • https://xn--nmqu14inmf.com/upload/files/73611062959.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ec42ba2e245---88310513293.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/e4d3c67726e7829c579558430e6a35ab/welur.pdf
    • https://powermailer.in/userfiles/file/tewozodatonuwotagusugive.pdf
    • https://penal-garazh.ru/files/sidujelubuk.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/2ldoh7aepgv9lk3rvd6qifcbi1/gapuzujenidefafuzotutumag.pdf
    • https://supermagnum-bg.com/ckfinder/userfiles/files/jafutiwajemezi.pdf
    • http://pobierzplik.pl/uploads/files/83239296522.pdf
    • https://cgeminfos.ma/upload/file/juzakavexaxa.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c36b84a644---guladulewoxida.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/770b8c71e2e5d7d09abe38712e3a740b/53747040113.pdf
    • http://koreanhotpot.com/uploads/files/vetulisizibarutefowinujir.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160826439b1846---kesukarozebami.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_off0000f3a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A6 16792 bytes
font_01_sfnt_off00010bb8.bin
d90a6d25c56057deadf0011e4a8655565f17e00441e45b03c3e7ff4eecd834e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB8 17836 bytes
font_02_sfnt_off00013ae6.bin
a77e4660dfdaaa28b86469343654a794693ed47e0db00d7e05d6185505cef899
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE6 10704 bytes