Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e524f8f4476a322…

MALICIOUS

PDF

121.3 KB Created: 2021-07-05 20:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25bc8149d9aee6de96691529b678156f SHA-1: d5cdc18c98118887424582aecd94b2f96e9e8d3d SHA-256: 4e524f8f4476a3228cebf33884e34e2da3cb3badfbb217d0ea2cf160a0373922
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs, many hosted on compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://gute-reise.ru/i/files/files/40418386406.pdf
    • https://mariellatriolo.it/public/file/pesokiligurinotedev.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609772ff995d1---kigexurogidigubinu.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f2c5b0f20---kewukaruwogox.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160988b27cf513---wunofufigusupuza.pdf
    • http://chickenwild.com/upload/contents/images/images/vosudalipabaxirexuxobes.pdf
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/70831396464.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/rerr8n61v4jj0d1fs56gu5nbvq/55299357417.pdf
    • http://bertoniamministrazione.it/bertoni/public/file/82392964987.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757f0cde274---sowepora.pdf
    • http://files.ibiza-ferien.de/file/72376426522.pdf
    • https://musikkursus.dk/userfiles/file/65204102193.pdf
    • http://fashioneducation.ru/userfiles/file/faxisagusafufu.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/5evql49vd0fmfjlcffb9mhdnn2/89046632027.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073929045aa7---3298762413.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7c15c6935---82769798976.pdf
    • http://chronocertif.com/userfiles/file/xenowaberamiziwute.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/q1vmev52b4f4mka3vqih76ju7h/zafuwunusefirobuvab.pdf
    • http://phuquytravel.com/nguyenvanlinh/files/gimeso.pdf
    • https://rosycaffe.com/file/fojagilolasavirepomon.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de27dba48f---19769898420.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=consorting+with+the+enemy
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017a91.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17A91 16792 bytes
font_01_sfnt_off000192a3.bin
79a32d90a0975490323b04041f41df6a483cd7992f53216304f8e06db75e4f1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x192A3 17304 bytes
font_02_sfnt_off0001c017.bin
4a32778a1f79791d446a8be9b98cd38277be3607af833cfe168362b71720dceb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C017 10576 bytes