Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9ebc5ea0521d29…

MALICIOUS

PDF

88.4 KB Created: 2021-07-13 07:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b31b1adc282e7bf63260ac6db9cb32c3 SHA-1: 216cc1048e78de95edb863c2fd1126b6cb4e2b5b SHA-256: da9ebc5ea0521d29fd57a27fbdf3869ca936c8ec189542b479c18f371f3a19c6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, directing users to various compromised WordPress sites. The URLs extracted suggest an attempt to host malicious content or phishing pages on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8d77c59f6---nopoligudemebadux.pdf In PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609724a271384---33422083976.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/a8656917f3e6b1bbc34751cb6e0795e3/6585557455.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/34070117695.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/mgf92mrnlrh6o0ckgd7qfb69m0/88221280539.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210616225627.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735c4bec857---rerajupesipagegupiwirotov.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/57321182853.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/divugo.pdfIn PDF document text
    • https://dprkoreatour.com/uploads/files/vinaxetojajijakolukuz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9edd678697---97142271078.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/v5te80dfs0ntdunq5to07tf1h2/kovilajiwe.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/44312525995.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/7310726802.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d97188bec2b---nozexeduvosav.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8d5fa38de---lajixixenal.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/wejotokiwubulep.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/q51vkrnibap25anh97974rla2k/kivevebusu.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/34613093069.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/futuvobapujeniw.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/b41c6d98a437f5e568cf3b8be8f2010c/febetadunipi.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16090a85142d2e---sotowopisudosipam.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b3b30b4dd---palififevutak.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/808507684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=easy+pear+crumblePDF link annotation
    • 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_off0000f82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11046 10460 bytes
SHA-256: a4dc1c49aa39d96ab68d0789b53ba8fcfd5071a7ee8bbf4e9f6541daad6aae41
font_02_sfnt_off000127d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D9 17056 bytes
SHA-256: 1de96830438e559fb697fc4d025fde99b87d7a5339238f102cfef757cf9e128d