Malicious PDF — malware analysis report

Static analysis result for SHA-256 5167a7f86d99f8bf…

MALICIOUS

PDF

74.3 KB Created: 2021-06-26 18:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2cfb96daeaf0b8c5c649fc46abca1c5 SHA-1: 7a79fa5d2b1276ad50bd1b5f3af9fd89b1c32247 SHA-256: 5167a7f86d99f8bfc961c9ff4c4acdcfe5520cabe2c7ec5ad773766626340105
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, which in turn host other PDFs. This pattern suggests a phishing or malware distribution campaign where the initial PDF serves as a lure to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8ju3o35sdbgvoltgdfs5cjfr01/30418346444.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/dbcd4806e4b7d60f5b38f17e9cf1028a/52355229514.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b7627791c54---92790342629.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/bdcaee3ec5c1f8138ed6c24be90f841f/68488520198.pdf
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/28727061971.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/3531586811.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/fpvms57d8oud998nqslb3jch1a/vewogekapiwedanab.pdf
    • http://aldo-ins.com/userfiles/file/98118292339.pdf
    • http://arohitourandtravels.com/userfiles/file/jonijiwixonupulonasub.pdf
    • https://tvmreza.tv/ckfinder/userfiles/files/14764713052.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2376a7b2b8---8500035704.pdf
    • http://webinaris.training/ckfinder/userfiles/publics/files/81351292887.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/edbacba356128f5442236e1475200aa6/47176768635.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/vc1o01lqi5nf6oae376q76kdj6/zubaziruzefaxoxibib.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/ppohttt3aq9qefcqb8640f6kh4/87755500496.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/b4e3d55ab7b3937f953a7ca2edb88e94/difupunemapikovofefavo.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9444dd2df26d9aafe8d35a69994969a0/93010174516.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c5a923cd1---46034251570.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/1b531d47c7cd5f30aefb9510af51f5a8/vobomutesemisopatemefose.pdf
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/jozufenexogavoruzedaso.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a285c1bbf28---33021643899.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0b610b469---kirukozubetovebole.pdf
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/86097975618.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/7c2ea6c700b1ca87664b84ee5421a33d/fawog.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=best+town+hall+9+base+copy+link
    • 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_off0000c09b.bin
5fd3415a8d0511223cf4d32977ab248b7349ac2ac40d6b81d91dd2b7172d2deb
pdf-font-stream PDF embedded font (sfnt) at offset 0xC09B 16328 bytes
font_01_sfnt_off0000ea6a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6A 16792 bytes
font_02_sfnt_off00010281.bin
2a531dbba9ef56a8640ce987cb86315845f50afc7fa57b878875aa41019fff0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10281 11024 bytes