Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d4536131ffc2451…

MALICIOUS

PDF

82.0 KB Created: 2021-07-26 07:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e94d8f1302d9206f42a7c7b4578a7052 SHA-1: 1ddc7ed373d0d9084d43c03558fe32ed82dd230b SHA-256: 9d4536131ffc245107c5913d4607266a3b6d05891c05c6bbbb7cc3ce2637c5a4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. These links likely serve as a distribution point for further malicious payloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dc5789c2e8d---64224162726.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df93c5de2b.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f80a555cba3---91076046850.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/gufozizejokuzetudomizonu.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/8q1u05n426m6c3p2rf0t5if4bu/gevufo.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/69937490513.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/k3572mqpdqqbn2sgu0jlne6u6h/jofewesakovenizematowufoz.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/705a770f30cb13623051781cb9072418/36463391486.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf58492792---23328249946.pdfIn PDF document text
    • http://bacviettech.vn/userfiles/file/mewibarofax.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/57jtubif23tknr0kdo0rj3dtp8/99838381795.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/95173391801.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/86375835689.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/sarunavet.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/getetijegumu.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/18448636494.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/eb990bfd88fa11bd780979522727d2ce/34098720780.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/53475091631.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/d98e4bdec3595d9842ffb4569d478f69/tolufajufegusututirusiro.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/bitedazoxiko.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/faritewepagopumufadubak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=historias+biblicas+cristianas+para+ninosPDF 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_off0000db9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9D 17780 bytes
SHA-256: 7de5e03b3a23b3ad82f8a1cad3c01240107a9b2eda19dc331fd0cee98412f22d
font_01_sfnt_off000108b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B2 10368 bytes
SHA-256: fb783cc3d9a29bfbe0d883d83ff77136b7c7088847edfe4bcb9cb7f12f9d52b1
font_02_sfnt_off00011ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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