Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce79424a969fb726…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 10:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6dacde21b22427f4754c6ecb82fc9419 SHA-1: 196a4286ae27a0d84f1413670f1976dbfb7ca401 SHA-256: ce79424a969fb726daf77f87eaa54e55cab35c0564336a84fd0b03b4ee79a517
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or phishing pages. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/d1bae09134ae427e8ac0689551fe2eeb/65354680949.pdf In PDF document text
    • https://33mobility.net/uploads/files/gasufemu.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/lirirawutoxid.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087a9e577e2a---2040665148.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/ba0f4f9733edd80dde41afaf57a61731/24778667725.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/66978714064.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/j8p6n3p6pc1pdhn0qoibmk8pc3/8217283547.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/96221220420.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/86278489192.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/87555186431.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/23120345117.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/49896704965.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/lomepovitowozanan.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/45652915908.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612109fc09c3a---takeruboluper.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/197ca80edc5d9dc6701ab43016591f43/51941710539.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/d1pht3a7946gsrp4ibcenmrcn4/dikije.pdfIn PDF document text
    • https://rintrans.com/files/48614471854.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/9djuh5qj7727q1i0ip3ntneqcp/17748633633.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d359744ce---lazuw.pdfIn PDF document text
    • http://llux.vn/uploads/files/taxuralik.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/80959016812.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff9181aeaa---89318181301.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/8350e4e40b3b70eb1f00759777933db9/tifapugasirojabaluwogeko.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/lutidarefulirulanagij.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/6b7c46e76rbvh1f2klojahb5b4/45252297896.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/231057385048.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/87457342178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=secondary+school+entrance+exam+pdfPDF link annotation
    • 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_off0000da62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA62 17352 bytes
SHA-256: 88c54e3b7a87f1f904fb6ce81eac2e0fb0730fead3a5c603102c71ad699caa40
font_01_sfnt_off00010722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10722 11084 bytes
SHA-256: de147a41dc81d29fe6c389873500a320141e99c3511656d871ef4df9df9158e1
font_02_sfnt_off000120db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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