Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bee937b1762dd7f…

MALICIOUS

PDF

72.0 KB Created: 2021-07-05 06:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 799a9b48896ed62ca4018d1941bf2b45 SHA-1: c9b5e106f839b7f6b84bb3ad757eef872eae8340 SHA-256: 6bee937b1762dd7f0d94b64995d2f239845e860230f36b3618e421ccbf3612c1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous embedded URLs that point to compromised WordPress upload directories. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5d2c8ebd3---20190059883.pdf In PDF document text
    • http://polloricowings.com/uploads/files/rulikibikil.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4650e1be5---39197332932.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/f64712992bbe1d11942efe26b8f89e57/xumogamupo.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/banetepozanepomidukesexum.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac7b9c34f2---kexuzufevavosux.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609573e01e317---kolinivakikosof.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/mezusukula.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/67732944675.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/roxobojiwatusupimodelisa.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098670e4772a---zufinogusizemapusa.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/vedesodaj.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/97224468776.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/2phfk3mgfjf4cdsu0s21nnrn8d/dusotakibomagamawodige.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/47163013899.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/54067881155.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160744f891ccbf---85996736332.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/6c7b62e7ec9d1a9f0ea7841a4500dd65/28667738855.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/73016863028.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/kozomeveputatovuko.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/tomopiduviw.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/ebf0619fff7967b68ad96f3a9536b1d0/48372623556.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/6bb8a8e459071e0ac48ab7ce169de785/8238035476.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/nikn2tk31cc4vgtc1ogsfn4765/jiwudimewajidex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=belly+dance+musicPDF 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_off0000b953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB953 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16A 10480 bytes
SHA-256: 1e9dd09cca307d2a657c8b3b7d08ad5224c080b8f54fdcb8b73151885596b7c7
font_02_sfnt_off0000e92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92D 15720 bytes
SHA-256: fffb53b7b5d16b7916e680fc37f5be9fe041fd75bf10d0e8fcf7319d3d89dae8

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