Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7a2194caffabcc…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 00:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fc5567091ea1b9a2184b5842e9c7144b SHA-1: 19ee35acf5c9d41ba6410d4bad417702d54801ad SHA-256: 3c7a2194caffabccf65c4eb940d11eb8e256d1104fccb46de89aeacf2bd04fd1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised websites and a deceptive download button, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing lure that likely leads to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=composite+numbers+between+1+and+20 PDF link annotation
    • http://adhunikjewellers.com/ckfinder/userfiles/files/53203089349.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/61626520356.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/mofitogigezenojazepaxukit.pdfIn PDF document text
    • https://kawanmto.org/contents/files/benefemozof.pdfIn PDF document text
    • https://successalpha.team/upload/files/74524385416.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/diwevojejimata.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/xanopojozuvilugopogiguj.pdfIn PDF document text
    • https://webmenuplus.com/images/file/tiwuneroputupujise.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/nezexigixok.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/gusej.pdfIn PDF document text
    • https://ebooksweb.net/files/file/38299118501.pdfIn PDF document text
    • http://nut-shell.net/upload/files/kasofovonoxasoworamap.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/88335847483.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea1e45e490---77972075042.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613736c4a9842---79464735221.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/9858014159.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/54264569352.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/93724988839.pdfIn PDF document text
    • http://1careglobal.com/upload/files/laromafulanututovamebetiz.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/pokagemo.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613592a980dc0---diwol.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/73dbc703d4a647962afe8b9e82481bc8/60912065658.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_off0000d4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E4 17372 bytes
SHA-256: 1d21e7818495b9f367246ee16531c45a520a2b79644eeee7a70a450c5bbbe9cb
font_01_sfnt_off00010229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A40 11160 bytes
SHA-256: 1b9859d45025a8e52b2f913e73e609e22a1c96025213216b2524d0a5af8bdcd4

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