Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5d6059f757a8ef…

MALICIOUS

PDF

85.7 KB Created: 2021-09-03 11:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3e835e3fa8ff10b01ffb9e8ed5023fd5 SHA-1: 720a495c8a5230d9b4fd1e713190dd068cf39809 SHA-256: 0c5d6059f757a8efcefceb2c22d984466c3b4309467f1c448b1efb6536738282
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to external resources, many of which are hosted on compromised CMS uploads or disposable domains. The presence of these links suggests an attempt to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://khiconghoixuancong.com/Khicong/admin/userfiles/file/lakemide.pdf In PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f4ee07966fae98afc3569a2c91034881/93972787447.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/8356711826.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/25233663472.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/tilozavovelajatoxera.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/63906164144.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/23886839780.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1627142175960821588.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160995f36c4c7c---25431344383.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cc4d823df---wibesapufivisoli.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/jugevuviluzinefe.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/lj0gm8epqqm9nfrgjuo76qld20/97224734241.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/74103903216.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c72bd2a7f96---12666497084.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/fiwamifenugusegi.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e581f64fcf---37224919768.pdfIn PDF document text
    • http://www.praasia.com/file/files/fuzunugevusolazo.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/0749c4be56a277832909b57396851634/numovuba.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/544d32cd6c3da1baac02a4c48bbd4637/3174291088.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/tarorudimogotenuxo.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8266a1312---muduwul.pdfIn PDF document text
    • http://pnalog.ru/images/file/xemimaxabumigo.pdfIn PDF document text
    • https://robertbah.si/files/file/donigolewesofoligibasomig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=manual+testing+questions+and+answers+for+experiencedPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/45306046377.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_off0000e350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB67 11220 bytes
SHA-256: f54d613595244c6de759b79b5d32096b4d831eeef8b5240ddf4a834184031f72
font_02_sfnt_off00011564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11564 19572 bytes
SHA-256: 6da78e1a17b1830b262d02df7b4a21a8368c3d84eaca7f8cf91b9045fbfd8ab2

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