Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf26d488fb32025a…

MALICIOUS

PDF

83.0 KB Created: 2021-09-15 06:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 06ce687dc3e3f85399b3b02ba103a729 SHA-1: 5ea51fc6880a32e454554aad9d1a34c2b4cc1d01 SHA-256: cf26d488fb32025a684b8ad65f0eb0d3646281630e032e72a9a13aa109085dbf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of URLs like 'https://smidgel.ru/uplcv?utm_term=world+war+3+apk' indicates a potential lure for users interested in specific topics, redirecting them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=world+war+3+apk PDF link annotation
    • https://panificioilcavaliere.it/userfiles/files/zalagujuwepuwofowobazi.pdfIn PDF document text
    • http://fsanaq.com/upload/file/2109031454508845023tgwgjwyu0ax.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/43584884534.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/13171548725.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/98606197102.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161415e29f2af6---45703385726.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/renepobe.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b394bc1831---nunisepawubefajegedip.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/panedeb.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/siziluvegupazejoxifinub.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414ceca72be---98258248565.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/fefivokokowogok.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161414ca9d1aa3---45597235062.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/a6727ba9ddca00902c4d809f83bf6466/11404621092.pdfIn PDF document text
    • http://foodchemsino.com/d/files/43826616130.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e305bef4a4---57485277820.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/10695944356.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/senazegoxifufos.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/mililolupikufapevinoxitoj.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa7ffe45a9---14238446691.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/gonalojurizi.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161410ec7073ff---sivunazelavotixefupuk.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/85170407636.pdfIn PDF document text
    • https://aayams.com/userfiles/file/21366024261.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/76351765136.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_off0000e13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13B 10136 bytes
SHA-256: 86a5973a0909e79049d97bc38d35e532f2f78fde03517d7316769336c1e68f17
font_01_sfnt_off0000f805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11017 17784 bytes
SHA-256: 6b2fd9fc8cce8438029d36cdcb5d1f96ea6851b3629ead5fd25cfbd2fd078904

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