Malicious PDF — malware analysis report

Static analysis result for SHA-256 337cfc4f1c22dbe5…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 10:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc48896f2a17bad187704980e9a6a83b SHA-1: b0e6c7cf4150b2f3f38ef1ee5ce9227cd5dc6cb1 SHA-256: 337cfc4f1c22dbe53ade9b468142d117587f1830aac6fc962fdb372db895d025
156 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, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd2f182c69---jowezifasafogozux.pdf In PDF document text
    • http://allycatering.com/userfiles/56656198017.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/wubuzenimajojugowuso.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326eb860957---xamemimez.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/24169793804.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/jewekamisem.pdfIn PDF document text
    • http://allasclub.com/campannas/file/58218222344.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/pavojudinefawoze.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/40520897789.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/sunawapokogomiwi.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/bafifubiromimuporirotoga.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/jekafononukopanadovapebu.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/10503915698.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0519b7642---pebopitisoxagodo.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/30172497242.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/17536138836.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/73514993950.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/bitamubazojuse.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/30740140755.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613316aaa4502---nunerutagukikavu.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/43812049508.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/40632281204.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/74355987348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=android+pc+remote+accessPDF 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_off0000d828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD828 18544 bytes
SHA-256: 601c3488404e4fe3af0e815a9b0b78dc0baaa94645539648c137dc8dc464f001
font_01_sfnt_off000107a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A0 10608 bytes
SHA-256: 6cfd24f7d5174bc23dcd3ccb23eb6a924e4c82cd476b32cbcd1e1315cd7c8f53
font_02_sfnt_off00011fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1