Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a550c58ec90be9…

MALICIOUS

PDF

86.1 KB Created: 2021-06-27 20:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a450661907594958d9405bf92ad9840 SHA-1: be721fc9f878bec67dcaa5e336e26ba500b1a508 SHA-256: f2a550c58ec90be92cf59f0a592f2697aa82a73461ae94f67b8d7a821cca2a0a
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 CMS upload directories on various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to leverage disposable hosting for a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe5bb0027c---sabelipu.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a90aed8c3083d03ccadd9a8c427f0f8b/rezetux.pdf
    • http://criminisiepartners.it/userfiles/files/nidosiwinedolefumugawil.pdf
    • http://chixue.com/uploadfile/file/20210622162740.pdf
    • http://hy-concrete.ru/d/files/mabusuj.pdf
    • http://119hero.kr/userData/board/file/54673996654.pdf
    • http://wumag.pl/userfiles/file/75021394730.pdf
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/2485965031.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d79643660be---7312186896.pdf
    • https://psfund.org/public/uploads/files/cms_files/goxakudazalomudojilunu.pdf
    • https://protradingindia.net/userfiles/file/73392605743.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/9v4uad4lqm65lfpcjcqhpbor13/vavebozik.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad111d8d56f---kibuvebisegegudodumodanaj.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a953676b0ebea8e5fc2850b895f9ce53/90625501874.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/abe490763ef262f1d7b4eb6d6b5d94b2/ditobomololepozafofu.pdf
    • http://airconbank.com/upload/fckeditor/file/60860003146.pdf
    • https://lesartsdansmonjardin.com/userfiles/file/20210530093205.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/1dad8d120qbunhe4om2h1p9bh2/buxedigudugula.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7833602321---mekamop.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c805183527---30035586585.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160876e15cbf22---50530678189.pdf
    • http://jevades.com/aircraft/fckimages/file/wunosaxumotaxeruriwopuxe.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a76039c41e20117edd3426b74177a054/nofamadogutuzobiwejak.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9dca2918c---64313356991.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pest+analysis+example+small+business
    • 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_off0000ef51.bin
78941b68e972676c8789be071614ac62520d9541fe645388c06e719eb497bea6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF51 16644 bytes
font_01_sfnt_off00011a93.bin
2697a63e5cbf43ef673a7d4329793475fa233c227fdf876c4147e37d2b970c83
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A93 10652 bytes
font_02_sfnt_off000132c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132C4 16792 bytes