Malicious PDF — malware analysis report

Static analysis result for SHA-256 8298bda1f61deedb…

MALICIOUS

PDF

89.3 KB Created: 2021-07-03 21:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1185f6c0de624c0bfb7248db04938caf SHA-1: e738efda2d76dff87ad8a5d14a97736c6fa665d7 SHA-256: 8298bda1f61deedb796d9cb39de5f44681b9f2abf4cec8fe4f8f2a22c4d1d9ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript, while not fully detailed, is a common vector for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=scanned+pdf+to+word+file+converter PDF link annotation
    • https://egyseg.eu/ckfinder/userfiles/files/ragebewoxuro.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/tugegaxabelu.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/bezixuboz.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/mutogoririfilagefab.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/a5191bb96b4576571f26c578718dba71/karulog.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/aep8gog4rlsnmls2auai6clug7/lunegetirogekulifud.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c15667c2---vadepunizojukovo.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/bakumowosekezebidijer.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160838eb36ed14---xoxebobewelevuwor.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/4057309748.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/cbe464ad993fe50df8eb8b5f61952f9a/64827956099.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/timjfe5ku644phjkjv44stem25/lerunozesopufe.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/58078595905.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/1f8c8d75965851260ea2534ea583d37a/15361808885.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/23749545165.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210630151246828563o89izo.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/61877350954.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///potunejobepe.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b954d7f523---bokazimivugaworenejeri.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/4fff54a3372860f7f4331fedd94f1498/wepewidakoxogewawin.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/fitojadenitef.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5a480c5fc---budamoxivuxoni.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/bgpsmrlfru4np62tlmh5dcngqk/11209805575.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/c69b332b41ebdde187053c86d92f176b/gofinulufowonugozijuwon.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/p4j12gl41dfo2f1173foqn511d/wosadigo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E6 17420 bytes
SHA-256: bb7b02e026a4828c9b8879a27c50494a2ecaf5156f8d027d8bba598af2eca862
font_01_sfnt_off00011127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11127 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12938 16120 bytes
SHA-256: 5cfa37fce0989fcd98349beccf9a63719aff29e66b00f3ba655f54b68a91f5d5
font_03_sfnt_off00013e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8C 10672 bytes
SHA-256: 6403df10b75d5e17ed96075639754f279023060172fb9e32feb88190a37ed979

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