Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8a1158a75fee36…

MALICIOUS

PDF

77.0 KB Created: 2021-09-07 21:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c0a302f5b1bddf63d771b40c1f80d801 SHA-1: cc15fce7ea705fcd5fe8f37009d01be06e2f9e5e SHA-256: be8a1158a75fee367efdaf171d2edde6d0a58180f16028910e16e7ead6aa0833
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating a strong intent to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious content, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=kptcl+admit+card+download+2019+pdf PDF link annotation
    • http://kwong-cheong.com/userfiles/fakiwunuvibixiwa.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f395ad94b---basak.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/24802064108.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608082ef4755c---kerukiledobefulesu.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/latexatunibi.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/waruvimewasegajegulira.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/lotenisividotenurane.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098235e42630---bofinap.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f952447c12---dedobanufazugolupi.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/6354cb26363051968ce3345164a5f711/ruxevoziwupanopuzumiw.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/29c0248b8c65f73a3f7848daa0af6b3c/gisinapemuzewud.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/69415205155.pdfIn PDF document text
    • http://creationart.hu/files/file/kajenovezonirax.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/14751186568.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/subebejulijonefalap.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/talejaxozeranalavugoxaziz.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/n7fsprh54aiasoo9raoeeqdto6/xowubuvilisip.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/7c53f49e07e198665aafc81669a5fbf2/85379853652.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39c4d9b7e3---bisegadakikabokakab.pdfIn PDF document text
    • https://telenovella-bg.com/files/bixukesujunamarozejor.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/19970560747.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/buvumisivisulolew.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/632aadeceda46109d8bdb3840eac35b3/89950406398.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c431f2595c---66259532837.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75F 17140 bytes
SHA-256: 357674fdfa835c8a4c7c649a7c30c80ea8210055727fae8d7879c7bb08c96cd2
font_01_sfnt_off0000f409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF409 11020 bytes
SHA-256: aed660fc521259bcabf561e9a0d5fb84f80a34b13c16b5cb87b420f019663add
font_02_sfnt_off00010dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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