Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba121fce94160471…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 23:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af33c91c480c461bbdc0733526a2b804 SHA-1: 8695464817d79c0cff8ac9cb0f310f94273e1cdc SHA-256: ba121fce9416047118f6b9edb4a9d4f40768e8c3b3b7b777b33b32165b79ebb1
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous URLs hosted on potentially compromised or disposable domains. The embedded URLs and the PDF structure suggest an attempt to direct users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://olivierdaulte.com/ckfinder/userfiles/files/solexefi.pdf
    • http://bingsu.ir/cache/fck_files/file/titefufajitesavakigagi.pdf
    • https://merohamro.com/ckfinder/userfiles/files/43734384978.pdf
    • https://bahceneryaman.net/public/content-images/files/55842999208.pdf
    • https://jjcfurnituremaker.com/userfiles/files/56643072679.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161447d575f4ef---82530134363.pdf
    • http://chi-kara.net/Upload/files/40759371910.pdf
    • http://dailycan.com/userfiles/files/63517714359.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16139d062c3648---66450052353.pdf
    • http://henghuitong.com/jingkelun/userfiles/files/20210908025939.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/fec96588be44d132f40134986cc02a3a/moxafobik.pdf
    • https://www.scmsgroup.org/ckfinder/userfiles/files/kinegaze.pdf
    • http://unionnutritech.com/upload/files/tusanavemopisusu.pdf
    • http://scandirent-new.ru/uploads/assets/file/sudalatatemos.pdf
    • http://swiss-ex.com/images/blog/file/9108485602.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1f3c6b5cc---68886241177.pdf
    • http://x-site.by/upload/editor/files/55372363585.pdf
    • https://yenicekentkaplicasi.com/userfiles/file/27295374384.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad9bc7ab4f---ropodonavekuboxikobafemi.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/d5b6e603de488461866c32372bce80c9/72480013090.pdf
    • https://bank-kredit.at/ckfinder/userfiles/files/pekogasekifalifene.pdf
    • http://moderncarrent.com/user_img/files/rikos.pdf
    • http://022-web.cn/uploadfile/file/20210918142943304.pdf
    • http://irinaburmistrova.ru/files/setebokikedafivaxux.pdf
    • https://capecoralliving.com/media/file/52274166625.pdf
    • http://maremio.ru/admin/ckfinder/userfiles/files/bibitufelivub.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=weather+cheat+gta+san+andreas
    • 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_off0000b31f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB31F 16792 bytes
font_01_sfnt_off0000cb31.bin
152d3b1961fcec014e986718841661a0a47d0cf1954282e51e594a5104a073a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB31 14552 bytes
font_02_sfnt_off0000efe7.bin
de6fac560f627dc01c8863456067c4b3437b49998f550793d073d0434b51d737
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE7 10384 bytes