Malicious PDF — malware analysis report

Static analysis result for SHA-256 932a38c5c34ea6d5…

MALICIOUS

PDF

76.7 KB Created: 2021-09-06 23:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a24bc0d9af0dcc60925c385f76f28886 SHA-1: 268c91ded12cc2b080176d1306f55e37acbd1835 SHA-256: 932a38c5c34ea6d5aa14236250ec0aec2046cbe1e4a2d77a1490b4c5d79fa198
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links to external sites, some hosted on compromised CMS platforms, suggesting it is designed to redirect users to malicious content or phishing pages. The presence of a download button lure further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=wish+clauses+present+exercises+pdf PDF link annotation
    • http://docando.es/js/ckfinder/userfiles/files/17005640234.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/josobip.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160750e1dacc38---86920477921.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/rosotexagakimukare.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/5180931734.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/65915444737.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/25582817306.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/tolujarajamoloterag.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/1b14ddbr3he41e346ov826h7hv/bifubekenetijeku.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/45uonddum8us3hdheoelrdq6g5/tekukubowiledezo.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5254081274---pokekatexakiwomokevuk.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/jegipekuropafapuv.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/19990982184.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/798a1b4dcf0c69a5b4a9d1021b5205a4/10802621575.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/vubidiwaxoze.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/61311981059.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/7639181322.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/vafidajikekun.pdfIn PDF document text
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/86747355399.pdfIn PDF document text
    • http://metall-press.ru/files/sinigiduvetisubukerun.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/fcbd3bf0a09c24031649b1f71eff175e/powowofap.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/87057748303.pdfIn PDF document text
    • https://yuss.it/file/wurulanopuwazuvud.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/93302236211.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210616055126232.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_off0000c862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC862 17056 bytes
SHA-256: a736cca8f36c64a5a144eeb5386a1562557278d247898bc137c453c6d6a4bae3
font_01_sfnt_off0000f449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF449 10792 bytes
SHA-256: 8823592808bbc5e36de5f086e76f5fd85a0aa1b9a6dca552bf2b8147dd65b74f
font_02_sfnt_off00010d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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