Malicious PDF — malware analysis report

Static analysis result for SHA-256 af320d9fe77cfbce…

MALICIOUS

PDF

83.4 KB Created: 2021-08-23 14:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 673bf6cbee242b49efc1c7f2bdedfd23 SHA-1: db52b3755ea4df84233a20deb8a75a5a31f00205 SHA-256: af320d9fe77cfbce69f10c57695744def74f70bfc807fbbb78849e22cebe7ad1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1553.004 Mark-of-the-Web Bypass T1203 Exploitation for Client Execution

The PDF contains numerous links to external resources, many hosted on compromised or disposable domains, suggesting a link farm designed to obscure the ultimate destination. The 'SE_SECURITY_BYPASS' heuristic indicates the document instructs the user to disable antivirus, a common tactic in phishing and malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://charlesstreetvideo.com/userfiles/file/41661679170.pdf In PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a89fb05b1---77084659593.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/90020124683.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/nijikajadofarisilifuzibej.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/29792829076.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/subudixa.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/bubasawagizuvonibused.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/75444275623.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/besoga.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/95193618889.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/60738070873.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/48349160216.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/vegezisixisesamajapose.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/pamewixuke.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/88574392749.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e0d1727aa---ligibidu.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/34355162755.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/25741089045.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/b0b21fb0e15b15e20b839fea86199101/92380371693.pdfIn PDF document text
    • http://irollee.com/userfiles/file/90624690249.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160828988be44b---36853455883.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/tegupevofavibiwitatoraxol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=download+naruto+ultimate+ninja+storm+3+pc+free+full+versionPDF 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_off0000d6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F5 21500 bytes
SHA-256: 9b2bbb51061eb9c7980956e46e45918d38e74e47f36bc0a37a50ad4734d2e03a
font_01_sfnt_off00010d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12557 11336 bytes
SHA-256: 7027d126be940987fa1572bc79c72a561624c160f62e4dd23163d39c26e7a9e0

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