Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e0f25ecc93d0ba…

MALICIOUS

PDF

86.3 KB Created: 2021-09-17 21:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d68d65828c25bc9738a1714644f23b57 SHA-1: 913817598bd907082bc159752f350e535f2b935b SHA-256: 41e0f25ecc93d0bab5b23579d662ef90794d59dfe47ae0384da1d4b8a3c8345c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which are hosted on compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=tecno+pop+4+lite+price+in+nigeria PDF link annotation
    • http://kool-house.com/upload/editor/file/65564475519.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/76038598799.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/patusapepowit.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c2bae2700---57179531826.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/22675908749.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/bonafakuroxonafen.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/20607537949.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/sikiwowojaxatesivafifovo.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614080007e7ca---99263309520.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/11803566150.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/36486601427.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/85427248364.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8b6b2de8d---32528103111.pdfIn PDF document text
    • https://curvy.tw/upload/files/bubigovikoduz.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/52849497836.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/53787250700.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/53574392758.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/bizutejewoxoluvifalobegik.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/pinibosilukimomig.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/jefotamuwe.pdfIn PDF document text
    • http://brlairport.com/images/file/4991081054.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/bagezeto.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/96395512113.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/xegowafebebupumasuv.pdfIn PDF document text
    • http://holzweiss.at/47026410789.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/26968280553.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_off0000e743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE743 19712 bytes
SHA-256: 6672b2efdeeebfaed6757057426fb39a9587c0526c27b22e8921193a053fcdcd
font_01_sfnt_off00011b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13349 10420 bytes
SHA-256: 559e8acf9c89a49920bbb63aeb99ae89cc058eb94b6cc5bfdee81afbac07d1a4

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