Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0a8cc08d6cab496…

MALICIOUS

PDF

79.8 KB Created: 2021-08-01 04:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3570933ab58043821fd8b6e6a42998a8 SHA-1: d61cd34a81154ce4cc449d160e8136d6464a551c SHA-256: e0a8cc08d6cab4964709c091169eb1639ce98a851d4d8947a992098d8b1b8022
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://inwebjor.ru/uplcv?utm_term=les+cours+de+droit+arabe+s1+pdf PDF link annotation
    • https://ketdoanbus.com/webroot/img/files/bereduvivudagibalol.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/39dbd3303d4d5e379c18f6c4bdcbbd90/52811127365.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da92316b66---99954699028.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087d0ed03263---topapiluzepoxorunepaf.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a94272b8054---31794162196.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/busebisuduxufubodik.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/73244967081.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/51884223882.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/c05ce6f04d8b187a716a2e21fd0ad5d4/mudeti.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/7657649761.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/zuxufufojep.pdfIn PDF document text
    • https://noddy.nu/images/file/tawofelorebifuzonebeda.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/takisefogikukagokatunefi.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/25884047510.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/9421537962.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/gazajuzewakafonepam.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/voganudadolidezid.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d148dd6e18---mudewe.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/41994385515.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16105d2f5053d9---bedupafabew.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/33377417474.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/f4aeec6a464218c3f7fe8f8706341209/tutowugarelomeziviworilif.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_off0000d271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD271 18020 bytes
SHA-256: fcb5cd714d4859a5896d9f7c4ef48cc0d38a5c683ff6a3cf61d6311bb81d8fd9
font_01_sfnt_off00010004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001181b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181B 10712 bytes
SHA-256: 69bb92c3bc490177afef9a8502800a2a2873b2edc1802238a51837a00073a512

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