Malicious PDF — malware analysis report

Static analysis result for SHA-256 151227c68f666c63…

MALICIOUS

PDF

96.8 KB Created: 2021-08-09 22:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05ffc7afe80b86d958ce459c5b898d1c SHA-1: 43eb0ca2918cdac803073fd4c184b680379205df SHA-256: 151227c68f666c634c8daebc94ba46e15b93a46a7f479ff9a0fb2bef2f74bd50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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://moto-trend.cz/public/files/fck/file/jufogelamewugikufinedek.pdf
    • http://ilyxrace.com/userfiles/files/30082178899.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f941632ea7---9498879284.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16082fbb8e83a6---pinademafavezijapopoges.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a124715dddded4ae7da641fa0daa9b97/62841600392.pdf
    • https://tungqibiotech.com/upfiles/editor/files/zupapasinidutewadijavil.pdf
    • http://alhs1973.com/clients/64426/File/81846743124.pdf
    • http://sahrugs.com/userfiles/file/japod.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607596335abdd---23659381800.pdf
    • https://imagebuzz.net/ckfinder/userfiles/files/39375021189.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/7da269d34e683b0a1febe1d574d74ecd/nekowef.pdf
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/6899538339.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608132ea0b9c1---10718710908.pdf
    • https://binhvi.com/upload/files/41475618523.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/pqosp9qsvkajh0bfkmv89tfh3r/pogetebar.pdf
    • http://inphuduong.vn/upload/files/75859555302.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b1529200ff5---46787337980.pdf
    • https://audit-advisers.com/userfiles/file/kowojovorunized.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e1cd3f667---67502049094.pdf
    • http://shepardfarm.com/clients/877021/File/xililow.pdf
    • http://mmt24.ru/files/file/perubajirefof.pdf
    • http://smn69.com/clients/866038/File/11904869344.pdf
    • http://sterkrade.net/ckfinder/userfiles/files/nisenaven.pdf
    • http://xn--h1acbpobggs.xn--p1ai/data/files/tovetowuperoremoware.pdf
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lovavodelijubepuzaginim.pdf
    • http://vyveva.eu/UserFiles/File/bibibun.pdf
    • https://dimensioninteractive.com/WYSIWYGImage/file/75166122652.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+spin+gun+rdr2+online+xbox
    • 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_off000114c0.bin
89730b005147a23cbe41f9c95dc0596bf049e1fe9e6b3606817b95215a660856
pdf-font-stream PDF embedded font (sfnt) at offset 0x114C0 10944 bytes
font_01_sfnt_off00012de6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE6 16792 bytes
font_02_sfnt_off000145f8.bin
900b8bf56d43c17b4eb3f0cb74c6c03bb6acc0eb29f4c324bca1d8f143f82735
pdf-font-stream PDF embedded font (sfnt) at offset 0x145F8 18316 bytes