Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f3a9294bd35279…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 04:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f8cdf7c388c26eeb196e98fe34df5216 SHA-1: 3451b4d85fe02b90e1a20df5b40c6eecb2d15118 SHA-256: 51f3a9294bd35279804f3b2595618dbb9072d4589013e9a942ec3459c5257c77
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/8niiu5lfq4vstpoqin5o3o2kgr/93265215114.pdf In PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/54739020454.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/69156634456.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/rugifekinuwemurix.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/suduxonumakilitidaxegodab.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/kiwepakudotu.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdfdaba20c---66567782842.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/zigaxomezelat.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/lefinoxidizakowasit.pdfIn PDF document text
    • http://vinmexindia.com/uploads/duwixukajok.pdfIn PDF document text
    • http://fitviewer.de/files/file/46024508021.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391e988e3db---27104026699.pdfIn PDF document text
    • https://bak.vn/upload/files/pobidenuvekedosif.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161336afaee0ff---53470358970.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/85276917310.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/48469128406.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/xugivobukonosu.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/37758485098.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/tatexuxesalesog.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/24854131833.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/93396186764.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/noxapebem.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/fowofosok.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/92821070084.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=quantum+mechanics+by+nouredine+zettili+pdfPDF 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_off0000d847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD847 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05E 11360 bytes
SHA-256: 007a7966412061080e4de6a1dad36cd1a1cd03ab8126cd80b8d698ac880d945d
font_02_sfnt_off00010acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACF 17020 bytes
SHA-256: 8579f8d851e3e49adbfa23656e80fab3455ca9d00584fdb72b25a36ee34f01df

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