Malicious PDF — malware analysis report

Static analysis result for SHA-256 650bcdef11117e61…

MALICIOUS

PDF

89.3 KB Created: 2021-09-07 14:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f21155df66bec7282ff74a038caf9706 SHA-1: b936f9cc5e48498f53d4677ed6c7f5527e3b27a7 SHA-256: 650bcdef11117e61f00fb850488085b4fd550772c32f582048673f40563574b0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and compromised CMS upload links suggests a coordinated effort to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • 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.
  • 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://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/59a73897e7c1fc6ae3c2e5eb1dc01584/51799608998.pdf In PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/f1423a510a53cce992168a77bf366aa3/nonamoragawugezuxugoza.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/35159834152.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89fff3a429---16208214037.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/89247749881.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/vuvus.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/10066412408.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/nipogebipagosonawegujur.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611f0d881672e---revazigajalukukotili.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/7cbd2258439edf32487817ba2a576561/74805457353.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/95accdde85c49690df46c1bdc5b6b843/kokomubi.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/wivatanopinedinuno.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1beb65e7df---dasogitusanure.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609af1f605081---11309627376.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1610e5b8309730---minafa.pdfIn PDF document text
    • http://fittbike.hu/files/file/33354228373.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/gujiwuvolozoxexineg.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f52a153d7c6---80106477542.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092183d1e5f1---42062704006.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/39195006367.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607df2c2b4eb6---27419445025.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/palru1eo98rae0toemncdkg9l4/dukotexagirujupap.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/58108446223.pdfIn PDF document text
    • http://jarosi.hu/files/file/50537267392.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b49229c91a---fitikajutowilox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=dvc6200+ad+manualPDF link annotation
    • http://irodori.kir.jp/files/file/xebej.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_off0000fb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5A 10400 bytes
SHA-256: 8d4d9b18d6cc7d977f9351ac0c84c5584968d61eb176584c2033fcb3bf8dc1f1
font_01_sfnt_off000112f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B05 17268 bytes
SHA-256: a2edb67f69d7ee329e8d9b79f2a52d4bd35ed2e9ddae4e8950af25506b6dce58

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