Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76aa8393c79b46b…

MALICIOUS

PDF

88.4 KB Created: 2021-06-27 11:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4faa80f2b6b93ebfddb282fcd618023 SHA-1: f0192531dc979cec3ab3ec007c2deff167a414de SHA-256: a76aa8393c79b46b6421a459f4ac436cbebdfb7e4e99547411f9941d7437c86e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

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 https://wastran.ru/uplcv?utm_term=webmusic+song+a+to+z
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/38093862363.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4d68980736fc4530cb1a8a07807abae3/kokunaredav.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b09112693---71941386466.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609202eda16d9---25225303069.pdf
    • http://zrdb-drogbud.pl/Upload/file/fapujemafiziwa.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077b8ce328ed---91009017894.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/46e446a4f4d2ef208a1a27c11099456a/88022180762.pdf
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/81820222832.pdf
    • http://sunjewelsonline.com/userfiles/file/9522912133.pdf
    • https://sindonis.com/userfiles/file/71840530784.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c31e5d6f94---7918558979.pdf
    • http://arqing.es/ckfinder/userfiles/files/lasiwowinegoragewab.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/a4f433171fc9d26a9bc233cd5674546a/xutujijanorogama.pdf
    • http://asfalon.com/__files/file/nupofugekojudu.pdf
    • http://igabana.com/upfolder/e/files/20210623021231.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/682e938774787a3ebea54d9bfb3fc3e3/laxiximutifi.pdf
    • https://balbok.net/admin/ckfinder/userfiles/files/tukigapotofu.pdf
    • http://skogsformedling.se/bilder_umeny/File/43168100531.pdf
    • http://aldo-ins.com/userfiles/file/juxoginefofal.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/h05c249eeu7770ul2u2bf6ko70/bixezekodokune.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/e19e6471d954897b0b6b27dbc645bd5c/29184978885.pdf
    • http://hzbmsj.net/images/upload/File/fegufe.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/153c5efab0cf3c27ffcf4ab1667e8c3c/39836245527.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1e30aac7a---7649238002.pdf
    • 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_off0000f67e.bin
654f73a6bbab6e76d26e96027ecd7ae8b41d20c3f12c4b822aa36ff43d3e2be5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF67E 17440 bytes
font_01_sfnt_off000123af.bin
0c2355d238b2fb4d0dc0902f996ad58816bd19564bee4ca01f0c85fa1d45d4a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x123AF 10720 bytes
font_02_sfnt_off00013c6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6C 16792 bytes