Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6cc20cb46b90ee…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 19:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0a1ff273d9fd2edfcf32fb6fa395c182 SHA-1: 2dc6e3831b939d200c529bca29455a8d1b59a5c5 SHA-256: da6cc20cb46b90ee898775771feaf3487c9c4be0539437f50cf907590bdfdc76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous external links suggests a redirection or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://yodishit.com/uploads/userfiles/file/nunarejoxepukajazige.pdf In PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb735fb3e0b---99079794962.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/redogomujanaguz.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/99cdb4ee1e5ca0e6c5e803c058c2962a/latafefezobuseveta.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/84738482092.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2119f70033---36785693971.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/volepeluxenoguk.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/qohe1rmvdj85ohv5nsu9gj8pae/momafinifozagujemalijemuf.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25c15197f9---57168041216.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/rarf9m7r21gdr82fg65k8pstlb/58742365180.pdfIn PDF document text
    • https://menu2uplus.com/images/file/famefamivamiv.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/62c0b961ba45b014c4492a159cc9919e/zizonesufejelizoto.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/wubizotakenulasexe.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/perexanisebajaka.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/turibavogizuko.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce9d0187114---papopejiromizinixej.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/52628945959.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/92c90b7d070fedadc2eee2c05cd75a0a/tinibireliw.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/34265739418.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/348c2c8d3007eeac7c6add945808820d/22348828534.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/a34235263dc16f95746d5422492d9a00/pukovaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=low+income+housing+tax+credit+handbook+pdfPDF 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_off0000d32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32B 19872 bytes
SHA-256: 0b8d22f935948fed8113316e44de48ad52bfa75215993d96b54a414c96d70347
font_01_sfnt_off000105b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCA 11496 bytes
SHA-256: 780de5b08901717dfe31fee7e04b37538631b315c3f0d9800d556980e6b8f737

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