Malicious PDF — malware analysis report

Static analysis result for SHA-256 daebb7c0c7fa836e…

MALICIOUS

PDF

86.2 KB Created: 2021-09-02 12:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fec4e69cb167978da07b936d25db41bd SHA-1: ab7598dd669791f9c8222f212ea41861d3e0a18b SHA-256: daebb7c0c7fa836e6d1d65a783a7d0a391b2b878edb138f54d521e543241fe8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's intended to exploit user interaction via these links.

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 https://queure.ru/uplcv?utm_term=nomenclatore+tariffario+delle+protesi+e+degli+ausili+pdf PDF link annotation
    • http://doktor-okonski.pl/uploadimg/file/94041011459.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/gafujinimoripobidil.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/lasejaparopiva.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a06cc5ea5e6---puxasizalanubazaper.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/0e18255607fcbd414fb245ac352ad4d4/78129282877.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/776e88cd7cad6279b3e09a52a80534eb/bifonovafisidoluvapiseb.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be48602507d---faboxigawok.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b95f5abf170---deluwu.pdfIn PDF document text
    • http://daydala.com/userfiles/file/24666239420.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/0c8b78gg25kohae3l22vk3b1qr/piwuj.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/2s6s37d7f13guo8889somp3l83/91081041634.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f49e0166f---67882254571.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160afa74abf9f2---pokixonavosepujiba.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fd0050179---82512477692.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/84hjucumqf8g0kksid2q670sh1/24034195505.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/41513223500.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/9197fdbb0754aaf05125796ba3800fa9/8460615862.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/pogegepeboti.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/95329620658.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/78812798719.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/kapodononinov.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e51bb8ca67---mifugiko.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/bozuzovodejutes.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607534bd74d1a---26627237001.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_off0000e7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E5 18880 bytes
SHA-256: 94329a70c18040e1b7e6c43a595dbf49a23131b5c906b06e46ec56735a6d2c1c
font_01_sfnt_off000119a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A5 11040 bytes
SHA-256: c15b21dc7431384ea3cc9c97d5bf7b664cd28b2a51416160363862abd8165370
font_02_sfnt_off0001331b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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