Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ad3a4c1b8903d16…

MALICIOUS

PDF

102.1 KB Created: 2021-06-28 06:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 978f319b373b41cabcce90d4d213324c SHA-1: 96212de54052fc140216fec7f38a83aeac60dc42 SHA-256: 0ad3a4c1b8903d16ab7798609fd4bdb846290bf4c64e498ef6e3ad8ef2465cba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be redirecting users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9358

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://archism.ru/uplcv?utm_term=nicknames+for+layla PDF link annotation
    • http://korean-school.hu/hangul/userfiles/file/46223996486.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e7c19ad97---pisejoganavegu.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/c496239ba9f015d6bf58dbfcdad43013/jipejudal.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160adcd1b26f91---tesitosirulanonox.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/33cbcbaa5be1f9c83791e68cd7299bdf/wanun.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/70526918929.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/76041171805.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fbe212311---favebupetuso.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/guwezanuwidesevofumenamux.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/powanulomibalabu.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/9955348077.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/72621245346.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a4524d648---borukikuwafujanelew.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/tisawa.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/3f84c34a1293edf798dedc4283cb1ed0/koxixewoxosug.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/927c7eecb0801759bbb24423f87eb623/sufuwuboxufavawadakigex.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fe6622f2e---13094429138.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/edlarbhhbnt7bpvlk4jsuor4k2/jijuxagilalunulaxefoj.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/vunibozuvamu.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/temapibakebojopixebu.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/01fb8eb20bb316aa4ea4e946858f40a2/39114559720.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/nabubesezufa.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/47616565394.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f6001c856---3274273358.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/nijewalinetedujekowuboner.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3ab50fc0e---431137724.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000fcbb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFCBB 19880 bytes
SHA-256: 6abf983fcdafa4454254b3fab06f711d08885b71a4af2559b8a7d4f9e62dcd5e
font_00_sfnt_off0000f12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12F 2732 bytes
SHA-256: c57ab9e79df2afb7349e6759234f613a43d994eb6f9714348526419ee38abb2b
font_02_sfnt_off00011f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0A 10584 bytes
SHA-256: 197f8f3f1bf9e2414139ffa01b119db2a3653a165b0a069407a5e476855721ae
font_03_sfnt_off00013730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13730 22272 bytes
SHA-256: ccd55e183a41864a76be1a688c071dc16b86c7e331ee756b9ac233b462ea0f64
font_04_sfnt_off0001709a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1709A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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