Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c259962673fa9a2…

MALICIOUS

PDF

80.1 KB Created: 2021-09-15 16:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c9a4c8047aab2c7b48c3cfebb99939db SHA-1: 1a45c2576e8a519c44e913e75ed62dccfec6c552 SHA-256: 1c259962673fa9a265ce97cc00c2e73011f38ac29020997e435c8972f2b24b02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites and disposable domains, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious content or further stages of an attack. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161410e6e8ffcd---87510508156.pdf In PDF document text
    • http://eminenceinc.com/userfiles/file/38992185893.pdfIn PDF document text
    • http://speckrepej.com/upload/file/devipo.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c51987279f---fevedepijozav.pdfIn PDF document text
    • https://dhesient.com/media/87283279340.pdfIn PDF document text
    • https://maria-galland.ru/files/file/tisodigojufofalarunabig.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/e4dd432c7e85bf2efc60348cfb80fe42/xedijulipu.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210914185225.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///pedamuzuju.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/45512063784.pdfIn PDF document text
    • https://mbbs.hr/files/50690775799.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/11733188234.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/mifetifalaxowara.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/tonuwoj.pdfIn PDF document text
    • https://everestart.com/images/stories/file/54851833118.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/90206165020.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/69400440141.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/78679441496.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/67779323483.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/fuluf.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/45810967027.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/50049463322.pdfIn PDF document text
    • https://dacola.com/upload/files/2092339347.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/2084952ecc5fd9ae9b6f88a8c729b7d9/71067263972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=photo+mixer+for+androidPDF 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_off0000d42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42B 10508 bytes
SHA-256: 0f3233a405ba076e53a8c25cba85292a6061cd8c4cd03a9be56eee887dbe1ce5
font_01_sfnt_off0000ebe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE1 18308 bytes
SHA-256: 0e69c67e54efc9bb1c8a3563f557c4c0498f0c22a9c1c381cf13f05a80dcd522
font_02_sfnt_off00011b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1