Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09b42ddd11a7eab…

MALICIOUS

PDF

126.3 KB Created: 2021-06-29 00:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 231c1172e342de4c9f5de1d46f9ae4d5 SHA-1: a6cb92aeba3f3bcf119eb2c53270bb49fba65f2f SHA-256: b09b42ddd11a7eabcabcea14ea12e34b8d0384207a8576803dd62e051eac55d2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely serving as a lure for phishing or malware downloads. No scripts were extracted, but the presence of multiple embedded URLs and the 'link farm' heuristic strongly suggest an attempt to redirect the user to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9869

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://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094213d9b267---4171035074.pdf In PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16093b30b403de---jujelimogitirifidufokuku.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/totatu.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce39475637---mugupum.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/54530488415.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/efb50e5e33f14b8f048d15b4e7a20733/9728164188.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/gakefori.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb7d50f45c---4561448382.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/dexamilisapubikijixonaf.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608583f15abd4---93635540804.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/xodenu.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/d3ouroah2ndp8mhbn9b27pba06/jeporo.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077718fcb224---vuxoxubovaxo.pdfIn PDF document text
    • http://rld-carbon.ru/file/89480989460.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607f35e91567f---lijuw.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/67984324556.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/gqkc3f73cabhjj09hi9lflfcc6/kilepubaremuxuwimarol.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb31e6b840---60513213314.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5485c1702---33195213447.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/44sigavea1giq176l8pj3fqq0k/59034414252.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/21134042819.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160864ae138430---6880587638.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb89ee235d---xetusoruwoxeduzisaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=age+of+empires+3+pc+torrentPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18486 10768 bytes
SHA-256: b23956bfd2d30f07bfcaccfc2552bb1cc1505a7158d21e78bf29f858e50b8cc4
font_02_sfnt_off00019d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D56 18188 bytes
SHA-256: b854da5186d6b4669eaf21bd0a6297cc35252990b8dcb722cc42f4bde480c821
font_03_sfnt_off0001ba3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA3F 18940 bytes
SHA-256: b9289a7140f58aae453ee6ea174b94d676c8a0ce239116cf4df4775a4a8e40db

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