Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24057ae210ccada…

MALICIOUS

PDF

90.1 KB Created: 2021-10-17 03:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 103397a34a531ef959b29d2f422cd32a SHA-1: 52b4f448262438045581f953f0a3f34e4ca429a8 SHA-256: b24057ae210ccada5a5e72f956c2f14795a5731cd4740208744643d917bdabf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, including links to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.tcf.gov.tr/ckfinder/userfiles/files/98352317995.pdf In PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/c463ffdb3235677e176eefb76a6630a6/luradoreguxinokutu.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/8399095130.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161371dffc797f---musizuranipipigevudur.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/namix.pdfIn PDF document text
    • http://trubaopt.ru/content/file/51195486083.pdfIn PDF document text
    • http://rilta.net/userfiles/files/liserif.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/ririjurul.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/golinonowiwimabisavor.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161630c2094c29---30445557308.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/75368312428.pdfIn PDF document text
    • http://k1a.ru/images/files/file/89953669332.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd2a848bc---16432581426.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/10277684494.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/laloxasof.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/lodipomogulej.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/lawesoletuz.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/50840414324.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/gavetasi.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/gexivibogasojafuwogod.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/saratabitaketesijumi.pdfIn PDF document text
    • https://thehealerspoint.in/admin/userfiles/file/78829179551.pdfIn PDF document text
    • http://btfa.tw/upload/files/6569820788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/HKUGBsJGI0E/uplcv?utm_term=jeepers+creepers+1980PDF 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_off0000fc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC20 10288 bytes
SHA-256: 9b286f121e71c66002db9a372d29d231140c2c06ac69efbbaef5d7aee9b01ad6
font_01_sfnt_off00011374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11374 18608 bytes
SHA-256: 12c455ef08189fc3d8a135b5856c8f558af18928568260450331c2ad416bb4c3
font_02_sfnt_off000142c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1