Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c0a93c4d6389f1…

MALICIOUS

PDF

84.8 KB Created: 2021-09-08 15:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f8b2d1b376aee330c74f79c62c95539b SHA-1: 69f4abfc6b3690ec22edbf24e12266a2f107e594 SHA-256: 93c0a93c4d6389f1616e446392b1ac174e662da9b7857ee44b5f49824f336519
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external links, with some pointing to compromised CMS upload directories. The presence of a link farm suggests an attempt to lure users to potentially malicious websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cw-cut.com/uploads/file/77761354925.pdf In PDF document text
    • http://vizugy.hu/uploads/files/files/23538248769.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/22538440107.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/96305314476.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/divowubikegelavalufol.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/nizozu.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/61aca686f4f6dfa99652e61e07a32b56/nifivoserer.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/gofurekoxeketerusomavo.pdfIn PDF document text
    • https://laser123.com/geektic/files/14727421676.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210908191307_1240344317.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/9034cb37ed039240c78a658a6b3fa359/sinibotapudamosa.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/39140828497.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c3ef8d06b---24807443241.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/25875850351.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/wimufavugage.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/gexofujobuvulib.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/4dc2fb4712eb7068418ad6113aaa4363/xeluneba.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/kusupupidugimaz.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613439fa4db8c---limokefiwobamezuji.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/genanupaxanurosow.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/loxugijivenirewuv.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/48086365223.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/30140927695.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/80574293159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=l3+desktop+support+engineer+interview+questions+and+answers+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_off0000e57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8F 17376 bytes
SHA-256: 7ab52282dbb1ddfb0eb1e164161f5e6020aa59dedda11d3214dcae68a9b21f22
font_02_sfnt_off00012a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8D 11244 bytes
SHA-256: a2eb950bcba3450b620d1df92922c23e2706bfec7e479a90d7377eda6305e871