Malicious PDF — malware analysis report

Static analysis result for SHA-256 065221006a78ba35…

MALICIOUS

PDF

78.1 KB Created: 2021-09-15 21:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c25e4707328d24a97b3346f9c772dcd7 SHA-1: 644703fbe11c7c8283e8ceda999c030276099564 SHA-256: 065221006a78ba35f8a91def2a23e8db9fa0db38115af87d847afb835b88c8c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://chcial.ru/uplcv?utm_term=miui+alpha+launcher+latest PDF link annotation
    • http://aptekadc.pl/userfiles/userfile/8671267434.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/14668534868.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/82182687600.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/toder.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/94447425606.pdfIn PDF document text
    • https://fong-cai.com/upload/files/22254908956.pdfIn PDF document text
    • http://annabarons.com/files/files/97261826955.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/312bd1a4acafdcb63f56ce62a141b1cb/83999544734.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/94350538584.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/c9526c7913bd30a727650202a09260a1/vikatijezigofidodagu.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/96675797283.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/vipazapuxogazivisovu.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161395a0477a0e---gitunemovag.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/21020677953.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613790aa21db1---34259884424.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16138c00b35c25---sowuwutewubop.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/sesejoburu.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/xibajupokerevoguduj.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/45822989897.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/32671699442.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/59714985985.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/maxezekiralifa.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/wifakugebe.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_off0000cea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA9 10444 bytes
SHA-256: 7e604576831c776510d2c74c9b54a1cd091164a0f6eb7367fbb7f3e5d723dece
font_01_sfnt_off0000e648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE648 17368 bytes
SHA-256: c0c076413299b07381971b196f0008ed2889670ecfe3debd23b36c660b31fc4c
font_02_sfnt_off00011330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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