Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbae3cb3cb038f20…

MALICIOUS

PDF

83.8 KB Created: 2021-09-14 13:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d2f5d537c0718e27d72af2a275c21d19 SHA-1: 049693cf8f9ab5efad0707ff5ec8671f1590ec8d SHA-256: bbae3cb3cb038f2025998c1e8ecb7434126114f33210f13d25e72a0999c76106
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute phishing content or redirect users to malicious sites. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://accessibilite-salle-eau.com/ckfinder/userfiles/files/pozolazawegodegiwena.pdf In PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6cd0b5958---zedefixenowudesenomonevil.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/s87g89b9im6serof9r9tjk9his/vurukanevekemor.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133806c14bae---tuxifuginapudukulotuvif.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137a97921e00---77295223293.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/o29vad0l1jkks0mov8aka4s1rk/rugalofiwexesulibenajed.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/jovatodetodamo.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/xawiw.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f948f3df6---2944543267.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/32907765741.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/36100138197.pdfIn PDF document text
    • http://jfe.hk/userfiles/76907710507.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/kawesogipiwir.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/japimojewilero.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/kopapejoje.pdfIn PDF document text
    • http://bulmarconsult.com/files/wagifatanebaroxomerez.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/51465392008.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/16068593237.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/gofoxizurevexexejomozul.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/rifitexevur.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/96011305.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c2b977b8e---30541863258.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d402cdd869---zujomomexisasixudedu.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/kabinebexexatosapuminefen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=dua+before+mealPDF 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_off0000dc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF450 21056 bytes
SHA-256: f703ae425e3a0d456bc9a569872328d130c872d8d2df6f17fa9af7e744beae38
font_02_sfnt_off00012b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B03 10156 bytes
SHA-256: 9d089828942682f1ee752ca9ac8b1a358585c303476be4b5cf327e9767b9fdee