Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ab23ff2aafb978b…

MALICIOUS

PDF

83.3 KB Created: 2021-09-04 15:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c94abe2544d409adbb18f3535e10ea0d SHA-1: db8862115525668516fdb8b2058fab72f559d484 SHA-256: 5ab23ff2aafb978b76f808e7ee3dd98ac083a062a99c62a59397f325f09c2cc0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of these links and the overall structure indicate a likely phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://hongming-eco.com/userfiles/file/nijeso.pdf In PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc977855705---litixobopepotajuzab.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/74690934560.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/28419711534.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f131784f50---84019797142.pdfIn PDF document text
    • http://mousike.it/img_ins/files/ruwuvivajirowobeb.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/fuzilupizizeza.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210802234527.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160790af6bb534---76987619199.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/4b6dba7a180dff8b88ba1194fb56fbbb/1331087297.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///lenomafogewigukenavema.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ea4270359---gemeguzopifaw.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/xudukepetokugolamige.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/96758021889.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/ngs7k0aogdr4kra8t91lsis1fd/lugimidovejepolin.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/39431990060.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/13264516342.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/80093492690.pdfIn PDF document text
    • http://accronline.com/userfiles/file/tuvezusobufibevamanod.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d529c1b6431---58005182522.pdfIn PDF document text
    • http://coolingrealestate.com/your-home-cleaner/FCKuploads/file/xijanapufetageninopezenif.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/dupubimax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=chef%E2%80%99schoice+4643+prontopro+diamond+hone+manual+knife+sharpenerPDF 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_off0000db53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB53 17452 bytes
SHA-256: 672eff8bb99761ea46a6a741cfb53ee4e1b6e2913af3d579ac77cfead0064b16
font_01_sfnt_off00010839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12050 11580 bytes
SHA-256: c7b78f91060f2b15570caca583d199e0ab6e6966bccf2263a4005f8f4c0a1454

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