Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fc47cbde319cb6…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 15:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0b1b432380f9f9bda9ca6c4b045b7e70 SHA-1: 3b8339dcf0e07e7429df0cc5e366464ccdda70d3 SHA-256: d5fc47cbde319cb6225cb0016b481e41e145ca89a9a0a100d0bd4fa615510f01
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised or disposable domains. This suggests the document is part of a phishing or spam campaign, likely attempting to redirect users to malicious content or download further payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://oniceh.ru/uplcv?utm_term=best+file+transfer+software+for+pc+to+android PDF link annotation
    • http://dissanna.com/temp/fckeditor/file/mukuvinim.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/i6cf05u1lk54r3g3reb2hgn2t6/42517151895.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/6e3df9597424c444d977a46f5ac9dfd7/6085974295.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/161386c89b84bf---lanevumaniv.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/54314120335.pdfIn PDF document text
    • http://tayles.com/uploaded/zabuverezodajakomini.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/wozulitaxabobigiwurox.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/26597684539.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/76367559405.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141767c9d107---43963553454.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090209444152.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/kesotevimuwupitov.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/83863097837.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/lupaxaxuzi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad916ed1cb---52192620460.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/71127099569.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140158a856c4---56380943730.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/57459296164.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/26309517094.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210917233357131325m9g8pn.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210909065957_2070884096.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/424786675.pdfIn PDF document text
    • http://allycatering.com/userfiles/tudenorijewirimujapigaro.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/jizumataletinap.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/mivavorugefudanasoxizup.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/nutarigoremumewirekovotaj.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_off0000b398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB398 10752 bytes
SHA-256: 759a1846d779888e982163497d453216b460e197fce6110d1dc453ca72b7dcda
font_01_sfnt_off0000cc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49E 15992 bytes
SHA-256: d1e7e09037ff738002a75a02b196eaa844b7570a583c30c7674d10d26dd3c095

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