Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ea5a1006174659…

MALICIOUS

PDF

87.2 KB Created: 2021-08-19 03:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6a82e1744a95576118501a5942c4d129 SHA-1: 532c65d49a23694ac48111047aa6dc77d8c188c5 SHA-256: 49ea5a1006174659a287db679c461fab07d9a8951c86ab705a5eb2f630fcf95a
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating a primary function of redirecting users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://cructi.ru/uplcv?utm_term=graph+worksheet+biology+answers PDF link annotation
    • http://heatherjansch.com/ckfinder/userfiles/files/libezuguzajob.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/rejanexusixolexolarug.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2b2dcd4bd---vusiwesubinuwano.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/54016834359.pdfIn PDF document text
    • http://kaies.net/upfiles/file/23296474948.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c85498de562---sikijuzanupibitogatin.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/81392229019.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/8836ae079e4386078692f6f8d5cf1895/zemirawogezopapozufopase.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021062323490526.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/rafisaxujijibupajo.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/gimilinixirogak.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/641ce0d8c99c21d5124239d3535828cd/26947386261.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3f74e0129---kopijolede.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/fti8f62inea6fhidbdr1mdh7pr/xapobuvub.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16104c0387619c---11961713574.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/gitatexewizaxip.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e1e35b2c6---62552203188.pdfIn PDF document text
    • http://szm.hu/userfiles/file/dosivivap.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • https://sportsslife.net/upload/ckfinder/files/gusemesoviduzonuj.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/130ab51edb44f89b6f99796f79c15b0b/19193051025.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/80417294473.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD701 11000 bytes
SHA-256: 2fac80877f4d2455055833f4072bf5c9ab120fed8389e26223a06f9e77bd4ac9
font_01_sfnt_off0000f069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF069 16132 bytes
SHA-256: eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8
font_02_sfnt_off000105d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D6 19180 bytes
SHA-256: 487038f453d8c71184fbde78cf1c1c10bea7733bed171c0982d64e0d18351458
font_03_sfnt_off000136ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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