Malicious PDF — malware analysis report

Static analysis result for SHA-256 94d8b53e6d06cc03…

MALICIOUS

PDF

74.6 KB Created: 2021-09-05 08:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e1573b9d2f22d28f853834d57cffaff1 SHA-1: d347cf9cb9fe000d0bd34004b4bc7377eb48ab8b SHA-256: 94d8b53e6d06cc03fef4488ae603a609c7722e7d5f3247352d6001ced55a4503
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed to lure users to malicious sites. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The primary attack pattern involves tricking users into clicking these links, likely leading to phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://radiosmile.hu/upload/file/disexa.pdf In PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/uojkd3vohpmkjb6mkg9bf4247d/motumetopo.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ostsdlk6uar333bkih5fm8o1vr/solememokeven.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/xikema.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e61c4444e0---zufozatet.pdfIn PDF document text
    • https://areicon.com/images/file/83045819973.pdfIn PDF document text
    • https://yuss.it/file/17060761318.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/zelapiporodefotadogerubew.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/93116177988.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/b97f0e40da0629c4e0a3a17bdf0cd7c6/94566901874.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b926cedfc---vikemujekodigibumiruga.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/sigijevodatatuju.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16112e834425c5---witemebi.pdfIn PDF document text
    • http://soles2walk.cz/data/file/78695035351.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610696a76b32b---41683317792.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee38965534---75449960942.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/7cfffadb9e26a6830e076a1e0fd2bb94/fibawowasi.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45186d07fb---vigawurututafilatej.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/35847711137.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/kadalidi.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cbae0e7d6b6d918956578c07f4aeccc6/78503036997.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33f6e65deb---84480514845.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/84276228920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=jotun+colour+chart+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_off0000c204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1B 10416 bytes
SHA-256: 14ca295ba232788e4dba37a7ed16868b23be5a29da5c4343e5d7b4b38b1cba11
font_02_sfnt_off0000f1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A7 16952 bytes
SHA-256: a1c3efaecf99c55cac3ffb42ca9ab81a39c3f716ac6e0409721bba6b3a764280