Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f076745157d054…

MALICIOUS

PDF

78.4 KB Created: 2021-09-06 02:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8edd214968fe268e2488ae277f8a6f7b SHA-1: 4414bb78193b9fa4042aab7655e4ac8e5b13649b SHA-256: b8f076745157d0544ac59ef3642e9cb1dfa279e41d485b5d599c1b73e02eca91
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://oio.cn/uploadfiles/files/fitas.pdf In PDF document text
    • http://omg50yrs.com/clients/6/6d/6dc66c997efb3e4e8ce6e6e7d0694e91/File/sewidaloxe.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/giraxakisopitagusesa.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/13542369615.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ae899c3d2---kepudin.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/vopodeji.pdfIn PDF document text
    • https://aitalk.vn/upload/files/61054936657.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/d1f05218e1ae934dea2094723764a627/68151623465.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/vi1ht30890lj0s73obqq9ord5t/93455941671.pdfIn PDF document text
    • https://parc-hotel.info/file/86559562907.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/2689751559.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/69657493885.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/pilanorimudowiruvez.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/40639190102.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/mulerugumakeforojoj.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0c409c7ec8bba675bc46acc2a91ef796/98678126129.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/zinijezixaxuwuvavujo.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/9c1696d89bd1438afecbaa503cea130a/53097045003.pdfIn PDF document text
    • http://rajeshjshahani.com/clients/d/de/defaee86e9f1fedea086b53a5072ac2c/File/wumiwulodamuxiraxamuti.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/nutarixojurewekinilapul.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/t3ksb9pmi4bjaaprq9d24rsdc6/zenodib.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/93664586053.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/3560551261265b851ef5089224f7c1de/42772060308.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ff1e07cc62262c26b2113e1b421750fa/mujive.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/9v67l73ku6ve9m9ofntvpgj9ko/60840071541.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/lidimufoxoxuminezefupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=convert+pdf+to+excel+with+formulasPDF 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_off0000cb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB10 17716 bytes
SHA-256: daa62f11f4512abb884ec2a0ec5c41df664a3cf08f76e15a5975c5144377f252
font_01_sfnt_off0000f95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11175 11272 bytes
SHA-256: 864ba8fd270e0b80da2d1b72c7a7addb834c048dc7a948c7b7a7140dc502c42e

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