Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3d455a2768a5dc…

MALICIOUS

PDF

79.9 KB Created: 2021-09-13 05:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2e9b909335ff1a90432b086812b795cd SHA-1: 3c2216307e4b0d582e0270b5fee0672a3d618937 SHA-256: ce3d455a2768a5dcebcadcab2e6bfa15f1298a9f72c969c8544664635135a38b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be part of a link farm designed to obscure the ultimate destination. Several URLs lead to compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://irlanc.ru/uplcv?utm_term=magnus+chase+and+9+from+the+nine+worlds+pdf PDF link annotation
    • http://khachsanmyngoc.com/upload/files/zivutojamugos.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/kanaxifetekiguwomi.pdfIn PDF document text
    • https://plasy.com/uploads/file/30496598625.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/zisawuvupipunubulenupa.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/20384120999.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/7f94fe97ced023633370d512676b5bcc/tefil.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/85535549182.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132151310b88---46998860766.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/jefujokewa.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/zepovo.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/nepolebuvuvudabibixevo.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/bapaju.pdfIn PDF document text
    • https://proia.bg/userfiles/file/73078943766.pdfIn PDF document text
    • http://autodilygood.cz/files/file/80862156470.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/43930604464.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/464c8222fdd0df80ad536c0413b1d6f4/50161222986.pdfIn PDF document text
    • http://saydersan.com/firma/files/20143295459.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/guvejerejababuder.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/bakezezemavu.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/80124987795.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/96313422834.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/3df6d3fb960163b58156fb027e1b473d/2096100143.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e842fc9e88---1311877446.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/1k54tu0djm23b78ive7847tr1e/dibonajusegonuduzesijez.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/17411493032.pdfIn PDF document text
    • 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_off0000cfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE1 18476 bytes
SHA-256: 03332bf7d0f14bf9bf6e86502ff48ecb04c6024e799d958040405c8ba0b2e0a8
font_01_sfnt_off0000ff8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8D 11416 bytes
SHA-256: d99d9de457955787332fc20fb185f41c5ed7101b54e1882d5ac97ef128d260f7
font_02_sfnt_off00011a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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