Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d41cb2adb44d0b…

MALICIOUS

PDF

87.4 KB Created: 2021-08-09 05:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aa87b7afa842167a2348d8d4a199479f SHA-1: 15a9686cf851e18e2c2c3ca0cd527f74665e503d SHA-256: 54d41cb2adb44d0bcffe6a08eb456814a346403677aa386548ecd3697cb2a2d2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external resources, many of which appear to be hosted on compromised WordPress sites or disposable domains. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to distribute other content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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://archism.ru/uplcv?utm_term=goffman+presentation+of+self+in+everyday+life+pdf PDF link annotation
    • https://supermagnum-bg.com/userfiles/file/gofojufuxivekijese.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/mipiwerijufafas.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d24a48e90c---94392487243.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/mulodumog.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f243eb7c762---binibapakusaxuxotukikef.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/minotefob.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/41608316058.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/36359749130.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/873ce232eceb2270be10758dd3d570be/likozo.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/s02r3eon2qf3vqnh8cjkfge0dm/95768144220.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/4648587925.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2a8975f2a---42674255795.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/kepixowavexidabuxatebe.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/degifavifaxepo.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/tapafasipezana.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085694e91837---58381977836.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/nivanumewus.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/fabuzabaratololekuz.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db7a72cff6b---10213888726.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e018165491d---83093032194.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/zoforog.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/kuzasaketupimil.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/94532304990.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7f6832751---11549301059.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_off0000efdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDF 10880 bytes
SHA-256: a341c97c34f25eef3aec33b2d55da23103e2b3e6922552216c116ebfbf036ac3
font_01_sfnt_off0001090d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090D 18244 bytes
SHA-256: 527ea7bc545c794e6eea7a6e7ba0b1f9f619f68727a70f1a91dc7a50f559621c
font_02_sfnt_off000137de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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