Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c823aa7b32299f6…

MALICIOUS

PDF

86.3 KB Created: 2021-10-20 00:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 50b80d360cdcec35d8de5849d17518b5 SHA-1: ff0e8bd26badc25c3ae005377679b2011b929101 SHA-256: 8c823aa7b32299f6c2ac2b940d6721d79ab4f33d9034a6da4bec1c51466a6866
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=august+underground+mordum+movie PDF link annotation
    • https://appvid.eus/userfiles/files/3522291362.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139f9b1f0d67---64610501517.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/mizodemebijidoxonofuf.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615fb8cc669e5---lubijelugudip.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/63446229879.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/44597477933.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161498210d964a---85181597960.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/28582973768.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/98205603925.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/73087570263.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/xujudul.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161588d36306b8---pirifozo.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/xukoradomasadilowoji.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb19eaf4ed---97139926374.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615c0f18a8fb7---10614684729.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/sinexoverar.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/mukupumironisotovi.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/94096030598.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/zegaxas.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/41495399804.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/34149897533.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/35217134367.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/34636141645.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_off0000ea3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3B 10528 bytes
SHA-256: 7cba464fc4296ee940a2e4815892c97d00fc3527f05ae86656efc8444097b887
font_01_sfnt_off00010207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10207 19332 bytes
SHA-256: 74ef04fa85a8b7df2026084b0a7f36df3870f788eb91391f2bc80bdfaaab11db
font_02_sfnt_off00013381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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