Malicious PDF — malware analysis report

Static analysis result for SHA-256 833aa9a74c7e29fb…

MALICIOUS

PDF

94.8 KB Created: 2021-07-01 21:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92f83902ab3d9a1910ce18828f5903e8 SHA-1: cd7408a41427436923c7899619adb2d84d5adf24 SHA-256: 833aa9a74c7e29fb3ed5471aeee129031866bcd8fb3ba88ad75c1f7442610424
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. These links are likely intended to redirect users to malicious content or phishing pages. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abda20b403b---pimuzubogadupez.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b23025beaf2---79006600835.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/0uouq8tie6puuh4m06fdpla7g5/xotufidadurutadipok.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160820e33e6b64---wekesabedepomowa.pdf
    • http://okmarin.ru/userfiles/file/rejenisijukumes.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/d47508d470d8a3eaef543cea394097d4/48716211620.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/906a1155e9279c46fbdb10052c44d819/solelupujatikowopizo.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160786adea2664---26131677073.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc2113fb26---fexepuvokodifumod.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/665e8eaf01bf2e649dfb92ccbb65a157/26700397360.pdf
    • http://penzionklara.cz/userfiles/file/rapitupalupibemex.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf8a36f5eb---dutilipitisitifojoxaf.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609a72a0198a8---vebugagegadokibokapoluxa.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/90f68d878d4759faef8740251054163c/29767253386.pdf
    • http://cerescommoditiesltd.com/Images_upload/files/50442575012.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071075d2c0b2---6262909667.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871858ac40b---48691702415.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/2nos54e0138k4qh02dvqm8sisr/29044221658.pdf
    • http://eko-inwest.eu/upload/file/37299464779.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb282389ab---lidonafawukatot.pdf
    • https://chezgregoire.fr/userfiles/20014525115.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23d2fef999---zeteg.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=escience+labs+answers
    • 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_off00011132.bin
189c2dc73d110d0f15f9b7df88c09fbfccb7af58dfde413dada065b0a603a7d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11132 17580 bytes
font_01_sfnt_off00013f1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1E 16792 bytes
font_02_sfnt_off00015735.bin
0dce1a9728ef96dad6dc7117d44a5aa07918f42cfa012d5b0c534c25c6cb0bfa
pdf-font-stream PDF embedded font (sfnt) at offset 0x15735 10212 bytes