Malicious PDF — malware analysis report

Static analysis result for SHA-256 d79837682a847909…

MALICIOUS

PDF

81.0 KB Created: 2021-09-24 12:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6648ec8f289f46a2adbee04bb549b12c SHA-1: 10733c1fabdd9555b07d2465822f65f4bb17d79b SHA-256: d79837682a84790915466fc8d09d58f04b3de9e0d7144e69ac69e3c8c9532f01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/35fab7b87639bb00994aadc605e26d3d/perenujunutunopexaneka.pdf In PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/figerok.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/67216521670.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/tovari.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/10562583973.pdfIn PDF document text
    • http://sapthagireesyathra.srikarpagavinayagamills.com/userfiles/file/digatikaveda.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109232102471617.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/52819811440.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/59401704849.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/49951425705.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/248bca0e26d0210d1a410a49d6e312d1/jesoji.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/51de8120d7f018481a3a1cfb3d866bdd/1351609939.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/28577689306.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/78171256968.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/silosikezuf.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/2430095011.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/22f050e2c614ebeb8bf7bc23fa2ee1e3/tusegezisumenidiw.pdfIn PDF document text
    • http://vecsecity.info/editor_up/8969159697.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/31137263198.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/94541621600.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/tazevake.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139684681f48---45945886202.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/zefalelutolixov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=moto+e5+plus+android+versionPDF 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_off0000d71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71A 17908 bytes
SHA-256: a4c08766e945dbb9f33e5b58bbf7b8db2bca6b4c89467bf0eab7db80bc20eb41
font_01_sfnt_off00010554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10554 10676 bytes
SHA-256: 672bcb97d03d9b90fe2847b3cdb665ec7174b7372a3691d9bc61960d8a4c098b
font_02_sfnt_off00011e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1