Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb40ee6aa9cee61…

MALICIOUS

PDF

75.8 KB Created: 2021-08-14 02:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3bfbbad6f9b618b1d0c67178290f215f SHA-1: 218e1488b1223a6e8b5c745578216a0e18f2049d SHA-256: efb40ee6aa9cee6143e09e8897ae29dc9308424f3b6b62352a07fb0e847c67cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting it's used to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic of leveraging compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=the+tempest+pdf+beethoven PDF link annotation
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/546c790ba345a523a37ed40828d72aca/lanora.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8a188b4a44cff444120dba33a37b217/70244046890.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210806121116685195cmacg.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/77961724044.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/60252253682.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/c6530705c292f89b2cf7376399c5c3c8/biwokupivowevajedika.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/96962818736.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/tixanuguwoges.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/35511413724.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210710080420564159gki2k.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/90920751716.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/dumebozakobisujix.pdfIn PDF document text
    • http://sigep60s-ncbeta.com/clients/44785/File/51175105775.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/11385952218.pdfIn PDF document text
    • http://evola.it/userfiles/files/93862272911.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083b302be6ae---jezagulevon.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/tujelevewidu.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/742f7060e49dee8de1a7fd5f9e15fc38/43157957033.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/wesobovesabodatufizan.pdfIn PDF document text
    • http://altus.pl/userfiles/file/waderilanaj.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/006b544df1819a1e3017d470b7e47ff9/26353757842.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e3861e50716---69187936355.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/242104367689.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/sabapowaseximudi.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/k0dhjn8fuv00dssk6iediommc5/2796389382.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/61244212749.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_off0000c2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A2 10532 bytes
SHA-256: 7dc52793558762243a1825202c0cf53be3d5dcc6811bd5c56e526ee1f745ece6
font_01_sfnt_off0000da37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA37 17736 bytes
SHA-256: 48afb85ffe7afa4f048f1d4621e15ba3e134327745a21cbdb2c5db3bacb32d61
font_02_sfnt_off0001084c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.