Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c3ce51f80b3e67…

MALICIOUS

PDF

70.3 KB Created: 2021-09-21 05:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8be9c264cb835059d9537927f32a0972 SHA-1: aa942ed0f3e273f22cdd259f41f143a6b320edc7 SHA-256: f4c3ce51f80b3e674cf265382972012d120a31ab7e843c11ced1646ff63b58f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://huntic.ru/uplcv?utm_term=apk+dark+tv PDF link annotation
    • http://watch62.ru/files/files/5704771425.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/basojiruzuzonuxe.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/26904446109.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/webuzuxivoxinisusesenafim.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/c343026fde08bdb9ce7b3a667ed79ba7/93572900289.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/56937875107.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/vimizonasupewiw.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/14d8daa88ee9ec179d37f00d67e4f7de/rakaxijifoxeduvefukuzo.pdfIn PDF document text
    • http://zuche0551.com/upload/file/xujuvo.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/89291298754.pdfIn PDF document text
    • https://icbacademy.com/upload/files/pojizagab.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/loruxasuva.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/6c3e94a9f922f475423451cc0d11ff4e/62871017098.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/93004945004.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/47969974589.pdfIn PDF document text
    • https://bnovum.hu/downloads/dapavalexiw.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/zidigisuzafine.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161460eb5e25c7---8220275130.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fde7144b16---24414182493.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc8c1887da---19132336757.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/37508793148.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/nesilarutadutalifezawipuv.pdfIn PDF document text
    • https://redac.ch/upload/41495169963.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_off0000b4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD03 15956 bytes
SHA-256: a13aecd7fb38b09785c4bb5937e4967899fceb260b59e211e70c56ef4439de38
font_02_sfnt_off0000f605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF605 9864 bytes
SHA-256: dbf3edbaafde3d7b53c6d032d0d929eb51dee12257ec39c36b1c1f64c676aff6