Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf6faef80850728…

MALICIOUS

PDF

76.7 KB Created: 2021-09-15 13:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a5502c7cd63317000aca6f31b2adf7c SHA-1: f5224310a94b2823d9c5b7929c392b56be646966 SHA-256: 6bf6faef80850728df6b50763b81764e01d736b42c5d19870df79b79fa9a1528
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=es+file+explorer+pro+mod+apk+2020
    • https://saikekanglun.com/filespath/files/20210907191310.pdf
    • http://blevy.com/ckfinder/userfiles/files/piliba.pdf
    • http://suliaok.com/v15/Upload/file/20219111759442694.pdf
    • https://maxflowfans.com/userfiles/file/nasozu.pdf
    • http://itexpertdog.nwoasis.com/upload/files/jilogegutitisiwibam.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9aa6c3f12---jekokugiwagoxoropas.pdf
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/55035244641.pdf
    • http://uticachemical.com/files/upload/files/busidetozigan.pdf
    • https://monyetmesum.com/contents/files/minekonaso.pdf
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/noxikedasegipesawujo.pdf
    • http://telegid.tv/userfiles/file/sixizezokoje.pdf
    • http://leeandrewdavison.com/download/zarogaxoloza.pdf
    • https://georeno.ca/userfiles/files/63352547524.pdf
    • http://aallergy.friend-match.com/upload/files/posemifazipupipituxokof.pdf
    • http://sisparts.pl/zdjecia/fck/file/pojovux.pdf
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/fugogunoselazazulige.pdf
    • http://luxcottage.ru/stroykamen/userfiles/files/28495506690.pdf
    • https://rubyyadav.com/nbloom/fckuploads/file/sebivetatafikaxifapodatam.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/0ee59a83665dacc65afcf7ee72eb69c2/77368686450.pdf
    • http://pnktools-th.org/ckfinder/userfiles/files/18832549570.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/rv4fi5f6c7mri5jjjvq7bjel50/1405557913.pdf
    • http://gymostrov.eu/gymostrov/userfiles/file/sedarefavulux.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/56564950599.pdf
    • https://tecnomatec.cl/upload/file/dofefal.pdf
    • http://aaronandanthony.com/userfiles/files/6057994953.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c51d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC51D 16792 bytes
font_01_sfnt_off0000dd2f.bin
3d161b7d158de425b89cfd90e748e10a12159a0f942de747c9d9a2a4c7fa9e5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2F 17960 bytes
font_02_sfnt_off00010b9c.bin
b3cf39d23cfbe7a482c54a7265329cc71b199b1c871fc317ba71dbfb4815f22b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9C 10876 bytes