Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffadee36a2622978…

MALICIOUS

PDF

68.6 KB Created: 2021-10-02 15:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 90405d39c9508e5281089c19e0447880 SHA-1: 2e4c5f4de4c829b43c2ccb796ce9bcb2d32bc46b SHA-256: ffadee36a26229789b2c52fad028619bd392da412c45935cb909fcce33129c74
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or trojan distribution intent. No scripts were extracted, but the primary attack pattern is the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=learning+perspective+psychology PDF link annotation
    • http://thedewakohchang.com/image/upload/File/9025312491.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/8b49ce22ff295ae16640d6f79a16926e/metugif.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210919_AB91F3A9D81B509A.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/5563230132.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16156568809d07---26835718297.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/wipadonujolubes.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/23373846154.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/15196067721.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/wusurugebetesojumi.pdfIn PDF document text
    • https://mayxaydungdailong.com/media/ftp/file/kazunimoletewonufujek.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/17481375342.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/33278351539.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/38511027058.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/zapatibunijuxojitujupopox.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/58749583081.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/58508266068.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/movixixiredugirora.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/2c4e8a62663e3785ddd6966482b79b60/vipekimafina.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/39783311375.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/pejuxama.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/53841709441.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/67687068180.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/kimapirifadunewodasegesax.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/fizun.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_off0000af90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A2 14520 bytes
SHA-256: b16e8145ca0e77247ee3ce53d5ca112d15b11cfc92664126dc93b523e7e0ffe4
font_02_sfnt_off0000ec48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC48 10792 bytes
SHA-256: cab38c3d74416f2e909b65546f742c79337313ec18863dfab4d650cd266a6d9c