Malicious PDF — malware analysis report

Static analysis result for SHA-256 15af80f24187e4dd…

MALICIOUS

PDF

74.9 KB Created: 2021-09-02 18:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4daec33217cabd43af83ec10952fe8fc SHA-1: 31cb9900f705204206144a01411bd90c324adc72 SHA-256: 15af80f24187e4dd32e4a3daaf061b1e23c14c0e13485f40a8ae48550cdaf0a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. This suggests the document is designed to redirect users to malicious or phishing content, leveraging a link farm strategy. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • 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://huntic.ru/uplcv?utm_term=schwinn+130+upright+bike+user+manual PDF link annotation
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/8333b04bf0215d8fe0d84816c06f1a93/temupupewidisezoxaripug.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/9293358866.pdfIn PDF document text
    • http://zubrcup.by/files/files/lavojofufejakuxavumebode.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/eef3392ea0c8db045d85e6fb004469da/49086933867.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/votijar.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e60d02efa0---boginabobi.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/10914422788.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081e191b965f---juvek.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/48910589386.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/fewabugu.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c58982dd03---zakeguzevoxu.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/18291301706.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/1e0168924bde5e48ea357675505e2046/jogaf.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160985bfe32277---zisamofomoranuwo.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/vifimugotajulotonipesuna.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160878ec8c7445---tomanewoboginak.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a788caebfe5---21062035784.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/3585901177.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/92256620111.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a7816e263c---rilinakufipiwivob.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/46484479808.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_off0000be63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE63 11540 bytes
SHA-256: 0338a6f60f7981e15b9ed29312b67c17104e20f0723c62636afa176e14d4d2f9
font_01_sfnt_off0000d97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18E 17336 bytes
SHA-256: c4f15b2f49046072d39457937abdd962b25074acc7fa79c613400fe060f84056

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