Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de51c606f6ad46f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 18:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 547c139cfb526bc9751a47901ed918a3 SHA-1: 50f6ae988a870109caea60f51b2c1cb020bb0308 SHA-256: 1de51c606f6ad46fa71ca9e9a7b4dec9e150733fd055a8ce546eaaf2286ef29e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ClamAV and an ML classifier, and it contains numerous external links. Several heuristics indicate that the PDF is a link farm, with many links pointing to potentially compromised CMS upload storage or disposable hosting. The primary attack pattern involves directing users to phishing or malicious websites via these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://wastran.ru/uplcv?utm_term=house+of+hummingbird+watch PDF link annotation
    • https://sysyanginguvenlik.com/uploads/files/woluseruzifeduxiza.pdfIn PDF document text
    • http://markone-tools.com/upload/files/34982649035.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/522122237.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/gijonebetomox.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/ritika.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/botefaleteludi.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/foxixuwerudeganutuvakixo.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/dupabimebavowa.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161302ab8c2d09---pirawerijawegibabobarovu.pdfIn PDF document text
    • https://hinaweb.com/upload/file/84976369893.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/tibinofapa.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/zezakosetovosiwefapu.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/fuverufoxoze.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/wujatimegisiparogonigoti.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/hffa2i8kj922kl7cpg7311bbb0/reberobepegok.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/84320314013.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/35649454763.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/jokonuvokasiburofowijup.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6383b8f08---78701695536.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/6633732716.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/fejujeroz.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/24496620651.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1614053e827520---jimabupufovereji.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/mobazepiliwojulogino.pdfIn PDF document text
    • http://sungder.com/upload/44204421343.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/juganetu.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_off0000dcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBA 17608 bytes
SHA-256: 0c05e036eb3d44d46852f7486592c3c831ccc9088aeb0749bd05ca4ff6ade3cc
font_01_sfnt_off00010a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A7 11196 bytes
SHA-256: c0956c44a8903460e8793c59df26fe0cdcbdf66f13d55348920ef0f970ec64b2