Malicious PDF — malware analysis report

Static analysis result for SHA-256 c60a8b196398737c…

MALICIOUS

PDF

81.4 KB Created: 2021-09-01 10:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d300db8668407cea44e775f1182d904b SHA-1: 6faeb17291056a10d6cdee44a63aaabc460a1a19 SHA-256: c60a8b196398737c37a68cdb4b09f474eced5d47a8d10cc1cab1ff47aeeff5eb
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as malicious by an ML classifier. It also functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of JavaScript suggests an attempt to execute malicious code, likely to download further payloads or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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 http://zatuchlina.cz/upload/file/xenubo.pdf In PDF document text
    • http://globalaircrafttech.com/ckupload/files/54577954214.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-6-16/20210616152122290219.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/be29e5419508e4c5789f41a3013e75a2/pojegawowakemev.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/ad43a823b1d5e84f4ec593d08d717b5c/10569235728.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/kewume.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b91990ad3---labekijunominop.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/6102e5ce71181842cacf653ade924d88/94301893262.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/80763417794.pdfIn PDF document text
    • https://12shio2.com/contents//files/sokifuvazikirozomasiboxat.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/df36311ff4c6ff035a9200c0554c96d7/falidi.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160847d0076b7a---48255107425.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/1d8bbcf235988816acc290765d1e3fbc/15196735101.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b479221f696---zenalod.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607db9e0b3424---71548306795.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/11766518238.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/67888467194.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdd86b8b23---dejuzatikigitiloxel.pdfIn PDF document text
    • https://beaszemin.com/files/najeramezorogalota.pdfIn PDF document text
    • http://apvn.info/userfiles/file/fedujifewinaze.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16070bd2727396---bofimomidu.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/pafolisikalalosunanidebub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=witcher+3+ps5+remasterPDF link annotation
    • 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_off0000da32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF244 17524 bytes
SHA-256: 539355779491de44cede663ba7f28c951a6d843ae1be822110f837c6145c47a2
font_02_sfnt_off00011fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAB 10668 bytes
SHA-256: 903ec3e08761716768b826214988fbf4c5ee44c103c01ada6622bda3c81a4948

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