Malicious PDF — malware analysis report

Static analysis result for SHA-256 762eb94335a9988e…

MALICIOUS

PDF

85.2 KB Created: 2021-06-27 11:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24c5a496c47145b6e6002dc1c553739c SHA-1: cad113c49a9cb788cee5a38d0f4fe1a59f490070 SHA-256: 762eb94335a9988ecb3b184aa34daf0ed363607444df657c176e80096052f34f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised websites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were extracted, the structure and embedded URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://dekoblickfang.de/userfiles/file/8643006379.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e99287cbbe---84832010925.pdf
    • http://smartvoicecom.com/userfiles/67858272224.pdf
    • https://efnnma.org/files/file/84275901373.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d23b8e9fd8f---58332401596.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/zunofirej.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088bb911ea63---48474987298.pdf
    • https://clubforeducation.com/FCKeditor/userfiles/file/28569934720.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/b38f19d1967af81c738e5bde36fd2d30/26033212029.pdf
    • http://www.elstar.ru/uploads/files/72693859190.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608220460833e---xowesikojusipojubibomu.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ad76aa2d0c85ef80491273071e39999a/84667610604.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d9753e592dd092354dcc577e8bc7b1d2/lofetaleliriromod.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160aadcc95002f---motono.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dbd82cfa6---gezeseduxu.pdf
    • https://zemiigori.com/uploads/file/tewugusolegepanapi.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97febcf3dc---wexozifenofuwodorupi.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0c79e58f8---jakananigelusonunega.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47b56ec433---12701671699.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/a916a839e79153b02d411574fd28ca8f/tobugibo.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/93987ef67793082e0a734bf2b1967338/jodozula.pdf
    • https://wendi101.com/userfiles/file/90695377055.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+worlds+easyest+game
    • 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_off0000e8ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EC 16792 bytes
font_01_sfnt_off000100fe.bin
d89250e3a98d844e1bd94e2797e7785d72e2d41c44be1819930723afd70a6334
pdf-font-stream PDF embedded font (sfnt) at offset 0x100FE 17232 bytes
font_02_sfnt_off00012de7.bin
89e3a7ea8bc920406e369c7969e1f1b886cf9ad8416297bd1134583227f799ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE7 10664 bytes