Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0ab0e3a84ede83…

MALICIOUS

PDF

94.4 KB Created: 2021-06-25 18:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7b593d74eb22b92f1b7369414125d38c SHA-1: 1201f664b385b9aa94dd8c4f2ec781f56c0b84fd SHA-256: 5f0ab0e3a84ede83c932da0fe589eea96c3e6b4d1bc44ba7db005d176c867942
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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://coretry.ru/uplcv?utm_term=heat+to+power+ratio+of+combined+cycle+cogeneration+is+in+the+range+of PDF link annotation
    • http://bafiti.com/sklep/userfiles/file/96365995571.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/rtgm2401c6lg1enmpjppnrcje9/35101510174.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/mojolelido.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd7bfb8b96---78514248808.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/sunovavigikorilaxavek.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160917d7d43707---bawiditinuwawito.pdfIn PDF document text
    • http://www.celso.org/download/80963409247.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/zevenajajogo.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/9060b00aabb9107bb660fc980d62f16d/wutuperomomanotenikeruziw.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba0439627c---gerosukemanubojanulojutij.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b2e3b2406---besugufabuxuwugigexor.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4ae0aa334---2742953113.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/294ecbe0f7a5d4283647f084ec0fb1ed/kegotetosuteravogukuja.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/wopodiliz.pdfIn PDF document text
    • http://englishplanet.info/ckfinder/userfiles/files/fudaxe.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/0r868e4qg8l56l190qqk6m90hn/88275507977.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b33e5a2ee0d---boxunawa.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a215b215f1---92589231013.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/47247751960.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/vepamojudop.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607973694b856---xuvileka.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/67698020470.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160948625cc3b4---mafebexafinoxigurasis.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16071dc3824a8f---57173658335.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/gutuwuxepajefezetutifodej.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/pevuxomomovarepinebe.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/220113057621.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_off0000f1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FF 11400 bytes
SHA-256: e283bb39fbe0bbbb4f16106156b001e30572ac5090b93fd3d829687b2d01c6d0
font_01_sfnt_off00010c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C42 16168 bytes
SHA-256: 34837fdfed7e6dc9e8c1ebc45eabef1064a6e89f8cd536305124148a4af1fb29
font_02_sfnt_off000121d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000139eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139EB 18556 bytes
SHA-256: 85e9d30d9eec5b8206af6f79005237f3262ecf41ad33b2a5463264fc097bca5a

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