Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a26c54f4eb63aef…

MALICIOUS

PDF

75.4 KB Created: 2021-09-21 14:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4cb3fb085c0dd21b8e7384e2c1aca32d SHA-1: 934a428c8f102fd080b1cfbb3aea40b2a73aae37 SHA-256: 9a26c54f4eb63aefcab369e181905ec503e5c9c7cc6f1177e780a3690eaff054
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting or compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution through these links. The embedded JavaScript may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://smidgel.ru/uplcv?utm_term=see+profile+private+instagram PDF link annotation
    • https://gemicilojistik.com/userfiles/upload/file/munuduvajuvekunut.pdfIn PDF document text
    • http://imoroz.by/upload/file/faroxowefawisimatimifiv.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/89822718306.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/rulego.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/50084264980.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/wigubufagusezot.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/wazezujevegu.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/54581844000.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/jukulugobarem.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613886de4a99f---9784022362.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/baceb4c0bd1fa1087879217c8553e726/tugixinove.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/16248760251.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/ziwuxikagexamijafazo.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/89156459421.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/6fa3fc5b620b37f67486f88f28e8721c/62621952679.pdfIn PDF document text
    • http://aven.su/userfiles/file/75404327643.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/xarifutibinuzej.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/532636232613ee7cb11bd2.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/zirikadewukeji.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/24814448948.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/padaxezivowiw.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/jasepagotopezamuwifene.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161329af4f0a5a---viwizutubarojerovog.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/274844d886be47e589e3c901d37fdd10/63554987038.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/89538468476.pdfIn PDF document text
    • http://rubensova16.cz/files/file/befudunikasaruten.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_off0000c3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC11 16624 bytes
SHA-256: 2769c9a5cecdcf1c7d574451381ad0ef1d5ddc3271d828da8b0095b9e8d1917c
font_02_sfnt_off000106a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A0 10840 bytes
SHA-256: 4e621a6d781b409fa2e8dc79a99c001392d2f76ec07288e8df985fdf971a1f88