Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d528ea97832c63…

MALICIOUS

PDF

71.9 KB Created: 2021-09-03 13:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d89f7e47d9fc2477d799dd46b24555de SHA-1: 3fa25917868b4137680e4933c8b125a4f13a0166 SHA-256: 63d528ea97832c638a6ef81475cc39e4e6bd4b7ef4976f61bf6256f3a1d8618f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://sesconbs.org.br/ckfinder/userfiles/files/vefokobozazadawexejo.pdf In PDF document text
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/koraso.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/6553182040.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/3752c30ff238f3b0aa6605b8353a9f72/61425697949.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/2226802141.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/3312683579.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/mugufexubowitimavelobefob.pdfIn PDF document text
    • http://hifimarkt.eu/kunden/kronhardt/ckfinder/userfiles/files/vaputavajaxuvo.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/vadubenovaterumafek.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/45039983142.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab251c4f0c---49211573002.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/3977634d23d5cf4b0de29cc47cf5e8af/29161954762.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a2c28db8f1a79c6164560a800a118e0b/luwezafisasowobe.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d9d0837ac---mewevafisebamojinuk.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/28594594076.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/092b9fe2fa8149d2af873735098f6b41/jalavosejefimumijururi.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4204b61802---65315212043.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/eeknvt89hcs0525p10kano71bk/lumixabiradasedilevanepi.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/75241128314.pdfIn PDF document text
    • http://soles2walk.cz/data/file/64487447111.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/9621779035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=guide+on+employee+compensation+and+benefits+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_off0000b84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB84B 15728 bytes
SHA-256: 9b21ee987e69c332dd333300f04476fcce883ffe8a9813ce76219187604c1bb8
font_01_sfnt_off0000e043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE043 11072 bytes
SHA-256: bed9456322ec06f06720e56547c46f30bb2eb113dbb9b8e76ce6dd3f019624ff
font_02_sfnt_off0000f9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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