Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed31aad99290a9b…

MALICIOUS

PDF

88.6 KB Created: 2021-09-15 01:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3d055870de2eb01b32f68b2336a01f7 SHA-1: cb0bc9a3562eb1721a700186325f512b4a9aa904 SHA-256: 9ed31aad99290a9b1b4379de3dd3a1b6b9fc3d45b4da5215f95da78302d8f2d9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/visajanexamegevitanona.pdf In PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138cff5bf621---vipumaxiri.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/26678628838.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/kezanivuvinena.pdfIn PDF document text
    • http://agro-partner.com/Image/files/negajopajumijinuvuxetux.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/27511259024.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/maworikunuf.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/393c45a97bb80ad432b46b3c89aec1c9/42337950259.pdfIn PDF document text
    • http://ilkemymm.com/image/files/95261087374.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/mamuxenizidu.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401f1288dee---58263985272.pdfIn PDF document text
    • http://prmakeup.com/Image/files/badaxagudosi.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161411eedda824---lovopimigubevutewa.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/ganugetuvibewikopazeb.pdfIn PDF document text
    • http://huiking.cn/uploads/file/021125062235.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/gurebugofi.pdfIn PDF document text
    • http://balone.net/_upload/file///vewisuwinakedivogusef.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/jt6aju1lmngftt8riadr4eifh3/62783472607.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/63200960989.pdfIn PDF document text
    • http://ashioke.com/images/library/File/jexopolalijuxezapixajobik.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411d31d64f7---91845831013.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/95461592246.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/64821344153.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a7c7b2413f9309ef634a9d6f3af643b9/41307422084.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+permanently+delete+photos+from+androidPDF 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_off0000f388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF388 10952 bytes
SHA-256: 1227589ade8489a18cce470ff312276ce1e5f307890549bb659bfb0b52d1a92d
font_01_sfnt_off00010cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBB 18388 bytes
SHA-256: c7dced900b53d352cfb1ffa498e0c0877b01ed3b0bfaf70c87c0ed109466e6ef
font_02_sfnt_off00013c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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