Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc229cf0e90ccad…

MALICIOUS

PDF

80.1 KB Created: 2021-09-20 13:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4f407c08429ed79fb750b0c327cc7e9b SHA-1: 0d21899fffb00ca7a29c947a39292a8d8ce5d2d9 SHA-256: cdc229cf0e90ccad24e6aa7c082222223c1d049ec5ade238aa19fcc4f00bd6e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://abaj.cz/UserFiles/File/wujojetuxujasoxobizo.pdf In PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/kuzijoralako.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399cdd1df1d---bagizajegemilazelez.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/59086820988.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/fapevozezami.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/97802009676.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/11507515022.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/19199745084.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/14625673851.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/42523793910.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16134e87d87101---13192042011.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/17661076431.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109081101233904.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/46538549621.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/xununapojimovoteduwuni.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/30815033596.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/19215599403.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/216f27718c378258994ab9b6357921e6/17250971844.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b32073140b---86015790318.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/sinaxetokatugeriw.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/62397544307.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/23091142273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=class+b+push+pull+amplifier+circuit+diagramPDF 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_off0000d3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FA 17504 bytes
SHA-256: 57ce21e7fe1ae810131f0c7575906f09d9f0c3923c7af3b2103b09de08c0ceae
font_01_sfnt_off00010123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10123 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001193a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193A 11112 bytes
SHA-256: b74fc527e3dae5fd36274c92546252d1fe7bec627c152d121b7844809179c3ee