Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88ea93ce65a6a0b…

MALICIOUS

PDF

77.9 KB Created: 2021-09-07 08:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 386a61cb5e2fcf50d560228d719aa0b1 SHA-1: db88af6a578a418016381b85af60611ebad946c1 SHA-256: d88ea93ce65a6a0b028b066042d1625762289f0e7e0fb1d6c1c43b038749c9fa
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URIs pointing to various websites, many of which appear to be on compromised CMS platforms or disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nomylo.ru/uplcv?utm_term=un+autre+monde+paroles+pdf PDF link annotation
    • https://laser123.com/geektic/files/13751265199.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/neluzo.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16092b389672be---11861463864.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/61557674477.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/a8b277ed1e389ad311f9118b9bbff0e0/32843535240.pdfIn PDF document text
    • http://sivam.pl/files/file/15779429416.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/10393177993.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/gjfr56mof7n0upe3hqbmdfm855/8775370354.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/34046381074.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/sodadupuwakapo.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/41266067282.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160cff3b3473be---55912732057.pdfPDF link annotation
    • https://petrovsky14.ru/docs/files/sekuwazapamezadunuwafe.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/22509226716.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/letosarimozozuvokupamanil.pdfIn PDF document text
    • https://capecoralliving.com/media/file/devogazezuw.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/87108715255.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/26957551649.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/72f50c623c6d51a5a6e25785390ed5b0/jaronaragadiwawufe.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/1428367851347ba8c2ccbafad4c304b3/tobimo.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/92041996257.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a9fbb241a---tigod.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/8500425397.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC7 10676 bytes
SHA-256: 0ea264fa54b012f0e3347d8b2a8a88fff5177c8cb06d2a3febd5b4726beb0f7b
font_01_sfnt_off0000e33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33E 18652 bytes
SHA-256: 9fd94fe9e0f29109200dc570195a5da4679348740a46bdcaed0f9249f2959675
font_02_sfnt_off000111c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1