Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f017f0542d38d8…

MALICIOUS

PDF

89.2 KB Created: 2021-08-19 03:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 725d5d710635b6101ac2d88472af1331 SHA-1: 91a92f88d36d2f8f0d1e59d5565751261868ef13 SHA-256: 87f017f0542d38d86f822d27e1766554bab4dbf0830c2490eeba1cf42261b0be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to download further payloads. The embedded JavaScript is a key component in initiating the malicious redirection chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=plan+d%27une+maison+simple+%C3%A0+4+chambres PDF link annotation
    • http://curry-box-deluxe.de/userfiles/file/45092858672.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/90785268712.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/58408142831.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/58563159754.pdfIn PDF document text
    • http://iworking.vn/uploads/files/rogenizinevifutet.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/509252344b15eebdcb17d25864bf0b0b/21098705849.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/panowa.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/f31ouo2b2aig7m6fr9f026b260/zuzib.pdfIn PDF document text
    • https://aildf.in/userfiles/file/86709934002.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a1b900589---43919060290.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/5775152239.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/dafupenal.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/eh36k45ehft4d0effdq0s18l4c/29358513198.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/94610528835.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/15068291841.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202107/file/32970318174.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c33a2a8623c---zisirufif.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972b2769f1b---gedodamalizedow.pdfIn PDF document text
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/33623342611.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/10996284297.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/p4hhpm4uijh12g7imv7efn0ssm/25903315308.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/e330341ede8af912dfc90aba481d3d54/79877788347.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8D 19600 bytes
SHA-256: a8f8b3f9f2c46bbd2eb86bd3ef6c152b0ef438944f9c1bb98d6841a76405a99b
font_02_sfnt_off00010df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF2 17516 bytes
SHA-256: 432251e869eb3e47b7e5f6fcc84b8f6e1bc06dce9d425c47df53f4bab92df4cf
font_03_sfnt_off000139f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F8 11216 bytes
SHA-256: db8ea6dc6adfdb27889e6798331ed238cc79dad9f93f75acfd56c933c3014619

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