Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a63265f3470e6d…

MALICIOUS

PDF

84.3 KB Created: 2021-06-12 05:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 16b73a91ef9c36c1eea93245fd1ee889 SHA-1: 157039a676d6d699666d5b1ef1ab3fe993b06d4a SHA-256: c4a63265f3470e6d3934383bf486f85353072eec326fc1a7ef206f26edc56516
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=cheat+gem+dragon+city PDF link annotation
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9e0765a8f---51495349220.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/ca29617614e1e40d980a59d29fdbd2bb/telamixulafevuwedilajaza.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/10f47ee4118527308975cc58354a5d03/doxugutejalifakavelej.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/c65473365e339a72fb4fd9fcb6158890/45495728762.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c92bd5f618---43413279236.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608edbc59ae3d---dugoxuvopupuluzozabexez.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202105270427411738.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609b67308cebb---valuvujeveroloz.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/96d1b439cc736c70061b6574e2c9780c/vegoxe.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a75cefb0013---48750371605.pdfIn PDF document text
    • http://rideco.hu/upload/file/84487308071.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/galiz.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/313a3e54c1bd581e18453fb2113cf545/silul.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/xizabemixosawifime.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/68085316868.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/mefaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 5148 bytes
SHA-256: 1fb5a155fc9ca9e3bca5bfdd9a27320f89f742de89f5a7a58bf414b578fa63d2
font_01_sfnt_off0001032b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032B 3448 bytes
SHA-256: cfe4ecb4b5cd10ba5cff6d23b9f24eedc015c8b8bc11751fbf020eab1f95027e
font_02_sfnt_off000110ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BA 23972 bytes
SHA-256: 38628e861b91f98d375360fa8d6fd15291e8973f8c09f7fd5273220075a9681a

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