Malicious PDF — malware analysis report

Static analysis result for SHA-256 551c1afa30a98a98…

MALICIOUS

PDF

89.5 KB Created: 2021-07-07 09:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87589e53f02eea3d72c30f29c5aee9cc SHA-1: 33bcaea63aecf9dc066fd64e3c5ce7ab0ce85435 SHA-256: 551c1afa30a98a983471828730ec37cb3911a0040bf45c6a040949727a2a11e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload storage and disposable hosting. These links are likely used to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://crysiq.ru/uplcv?utm_term=unknown+fairy+tale+princesses
    • https://irantruck.ir/data/file/57076179434.pdf
    • https://emauto.lv/index/images/up/file/gudefewuro.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcda233679---fawezi.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/c5bd46ce2b7139b4462f3721021292d7/22146595696.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607974f07aaed---tavegizezexetoridimi.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ud78vu7rg60mlqb3bd1o8u0hgp/35292481251.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe2e7dadc3---pegezoguxizotuvepezagukuz.pdf
    • https://clove7.com/userfiles/file/75370323046.pdf
    • http://zrdb-drogbud.pl/Upload/file/35556672510.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073002d934ed---betonamisosuv.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/29768f3f1a29d3f4d1999a5cf9949bde/pajagizodepebeva.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/fadubotapudoxibixobexo.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c46e4c0c8a---16496639656.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/e47e42703d602b84de2833abd0ef0e22/suzub.pdf
    • http://jentretiens.ch/uploadimage/torimekumeforimerubus.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/musaw.pdf
    • http://sjhrz.com/images/upload/File/30138270175.pdf
    • http://rajskiewakacje.pl/userfiles/file/xujetabudalufufuxuli.pdf
    • https://invest.pl/userfiles/file/41913989935.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cbdcc949a---zanugozujasodoxedak.pdf
    • http://bright-inter.com/file_media/file_image/file/lidadafogatiwenaxunuta.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/9ge3i6gbp5k41fk9m1s7kbffn0/69838603610.pdf
    • https://jurad.eu/files/file/79426996394.pdf
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/41339500284.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/5afd0e5b96f038b0fbf2dce4fa45c15e/jipofolajuvag.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/8a5b73f69b9dc3810edfeaf8874f8c47/75306734243.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_off0000fcb2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB2 16792 bytes
font_01_sfnt_off000114c4.bin
6576448ed5b4ae87be6dae3c96347f00b8f6ad020b6ce24f01680871d766e1bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x114C4 16456 bytes
font_02_sfnt_off00013f49.bin
01a0e181938cea00dde25b6ad8f2d9e31f9b0eabbda0fcc0db2b20270d453ab4
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F49 10772 bytes