Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd03874db3dc8e99…

MALICIOUS

PDF

77.4 KB Created: 2021-09-09 03:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 89f20d19f86c11e202780300ca4ecbbf SHA-1: 3ae9eba93a1fe004b67a6bdbb3c8e4cbb4b1853b SHA-256: fd03874db3dc8e996e68275334c3678c3ca39e8810be5c99f76e31ae54166500
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lead users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://adabaskimerkezi.com/upload/file/51193629507.pdf In PDF document text
    • https://shopinhome.com/ci/userfiles/files/73178485078.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/82286256830.pdfIn PDF document text
    • http://mlead.net/images/e/file/gerijubomoruginigim.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7a5cf0dfd5de14af18897875b7c59048/sozekax.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/49214289862.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/37056859918.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/9d61d75020dc642378975747371760c4/62649170196.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/21762769117.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/30882373479.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/jajopaje.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/42461696325.pdfIn PDF document text
    • http://goldmustang.com/files/files/96685865572.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137613445ac6---fuvigewefofasa.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/wisupanenizux.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/53fd5b7c6d9a17e1209b4d733f66bb02/pezuzujuvisetegezusudak.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/zerekogemareme.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/wadefemipezejupudevanun.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/pulilefufeta.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/15086835857.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/89739176694.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/devixevolaxijumutowofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=android+capture+image+from+camera+and+get+pathPDF 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_off0000c5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE07 18316 bytes
SHA-256: 937dcc22955cceeb7726287aef4a6b8f9f62a38ceb45c03f868383ce30411bb1
font_02_sfnt_off00010e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E79 10936 bytes
SHA-256: 4c451a58963bebab07c819bbaac35667515ea2da8aa359f010f02c25a27ef73c