Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cccb46371244d67…

MALICIOUS

PDF

66.9 KB Created: 2021-10-03 20:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 595bca05ff7958ef4f0dcdbe9b6df140 SHA-1: 2c3342c2bee3fbbb218afb2032aff0aa5d17a4af SHA-256: 8cccb46371244d6700a8055f5a62808ccfc1c0afb8268e590b41ce1fcaa7fc8a
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. Heuristics indicate the PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure align with techniques used to lure users to malicious 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://garglob.ru/uplcv?utm_term=thank+you+funny PDF link annotation
    • http://simpelms.nl/userfiles/files/24163725606.pdfIn PDF document text
    • https://cicimanis.com/contents/files/19199716997.pdfIn PDF document text
    • https://ekransamara.ru/files/6378642013.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/tabosuwekoveluvedux.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/21575723551.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/nibizamepekiga.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161532d16a6730---41160027726.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/72774891946.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/jobapogekakezowo.pdfIn PDF document text
    • http://suaups.net/userfiles/file/7815551858.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/21819749678.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161497637f4173---fejewuzipokozibomen.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/50064979719.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/82257344727.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/38598540177.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/40317926068.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/421975073.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a0280e194---86356118675.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/25632878709.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/41447139484.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/96758608143.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_off0000ac04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC416 14696 bytes
SHA-256: 498ef4d607f09db70281ab99b6324ccaaff6a3b3109296b709678af7089fdbe4
font_02_sfnt_off0000e8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B9 9944 bytes
SHA-256: 25282bfd73db4ae50948386b21f7526c4afa9201047a384a600cf97b759f1842