Malicious PDF — malware analysis report

Static analysis result for SHA-256 4511912924386a1d…

MALICIOUS

PDF

84.0 KB Created: 2021-09-14 02:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 563fb1c55f6fbb2d818338fccc09c267 SHA-1: 062667b25d28ae145d65a2e30d92c64998180a98 SHA-256: 4511912924386a1d387f97819d58142df617dd20ff6fb08599594abdfabcc91f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised hosting. The embedded JavaScript is likely used to execute malicious actions or redirect the user, while the link farm serves to obscure the final destination. The presence of these elements suggests an attempt to lure the user into clicking malicious links, characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://bvphcn.bdata.vn/upload/files/wuwatirivuzotiwigomu.pdf In PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/9o36vbqlr12nqv3afhm5krmskp/63497815374.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091405454348.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/17754771667.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/77549038000.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc969eebf2---zinozeloxeso.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c1f483793---fadumifimamifidajolixigef.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/65485396149.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16135e79e5353d---90734694798.pdfIn PDF document text
    • https://luminex.pl/upload/file/73672387839.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee11054a7b---59591780086.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/utisotugifazenol.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210911202500.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/zobedizuxixi.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/25825657945.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/fulixuzedobalawabikufir.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/81527186441.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/32307856667.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/fikeloruv.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/64009108494.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/rufadunuwusedelorad.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/wazidubufimuwebutuleva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+good+deed+short+story+pdfPDF 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_off0000e4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E5 17872 bytes
SHA-256: effb4bbcea6f741fada51b0f0c08cd98e768a60159b18e5c9dadb6fff5bc7cac
font_01_sfnt_off00011294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAB 10452 bytes
SHA-256: 0c4d2cf94a44cab8699fa960bdc85628e84f4de1f7096f841070f10c82bb6fa3

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