Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d1ee28841307d1a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 12:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 522810ccfcd669674a7327f5ddc9f2ae SHA-1: c3eea145f1e8a34968a02571c29a1d18bd7810e3 SHA-256: 3d1ee28841307d1acd7f128587d51f663b3804323d57c34ad486fe0942b2076d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/m095pfack278674hu8fkl759l1/sawiditirefugujo.pdf In PDF document text
    • https://soechi.com/userfiles/file/25199551898.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/sabaxakekasesebomideneki.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/f930752a15b35cb2bac3bd60edb8c8b0/bujotetenugulowu.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/44816429551.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/xozureworowaju.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210904_CDBBB606B5A3DEC5.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/xosaf.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/jqvgq5f26kretnj23moc2ejan7/64327334769.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/39642985033.pdfIn PDF document text
    • http://ahchala.com/img/file/kikuwaruxowixipopi.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/74303251595.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/10033506146.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/3ece922ad7cdf1232ccef3d612c05029/56795907147.pdfIn PDF document text
    • https://cahayamimpi1.com/contents//files/9426407632.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/77347609575.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210814222852.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad14c52340---webetalodufi.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/283936740.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/mekabarugekigi.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/80710521489.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/potujirorofu.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/zimupukapijapapen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=nova%27s+practice+tests+for+the+toefl+ibt+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CE 23516 bytes
SHA-256: 3098fb6bc6cabba78f2df3ad780e1b4f421739e4297b6e0dc490214513380d5a
font_02_sfnt_off00011fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB1 10828 bytes
SHA-256: 9419ec359eda9d41c81f697f9ce26aadef562bf10f24cb1f30e243f567f1c9dc

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