Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f371b42fa2a5409…

MALICIOUS

PDF

78.4 KB Created: 2021-09-08 05:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4838e6247ad169c05bb5084c3f1685e4 SHA-1: eca920c1340cef606f566726a7b765649145bf54 SHA-256: 9f371b42fa2a540958b93681486b4d8397ebe31091f6be3c2190fce40166c415
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the primary attack pattern involves luring users to external sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=ugc+net+computer+science+updated+syllabus+2018+pdf PDF link annotation
    • http://vizit-k.net/uploads/editor/files/xewapakalefetelejuvizop.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/12626941621.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/lsmdlk072l3pikkrppge4ekj2q/wimugakadizunubuwu.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/bozafilisutewo.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af0af8b0d4f---43306265259.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/1cd631496fed67c9edc06ef6fd9c60c6/gudako.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/84064377353.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfddea7e44---65007990787.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210604102546.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/97ho85kldfvsnqp7hm2a2u072a/dokidizeriziju.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73d82ac9b3---49441366223.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67458952f6f0feaff9f72ddce5137350/zipelad.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/30542273666.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/28255895686.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/vutare.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/frcfth7dobdfh03f7uveapar86/tagefuzibet.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160819721a9c11---jisanurosozawuba.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5fe75ffde---96922534952.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/72900047268.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/9d9db91682e3b67ef4f37da875fdc774/bitebomidebutal.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/tilesetako.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/ed66a48ddb1a799df663cd96dbde6624/vemosokelolike.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/50212878047.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/53095552781.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_off0000c9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E5 11824 bytes
SHA-256: 21b91df53cf4b664558cc1e67a41d3268067f32bb671ecf02331903d1d252f77
font_01_sfnt_off0000e5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D2 17708 bytes
SHA-256: bc1a797fc13ddf74ed6531b9bbf78f12e3c46b25f7e6c3abb9b058a006614181
font_02_sfnt_off00011353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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