Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95908c8144b8d0c…

MALICIOUS

PDF

87.2 KB Created: 2021-08-09 03:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 7d1e518c9b9147d27f0c06df373190f4 SHA-1: 529919e85098b3c2d2762ef83b56ec7d7b4ffa0c SHA-256: b95908c8144b8d0cc890effdeb93bd130abc7f4da370b68aaa396f9f44fa26ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://barrybusiness-crm.com/ressource/devis-photo/files/41276633180.pdf In PDF document text
    • http://3suntech.com/UploadFile/file/20210709150500394.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/8mvp8f01itrstm6lts4op2vhu2/93032443167.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/2a1f9272f953de85f963aa3384099484/53183710132.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608382e84badd---fipugirivupojegidigav.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/wodanutifirakuwizikimivex.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160997bccb2e8e---69261526375.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce585b030c0ca0d42a4eec917bd84d4a/ruzif.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/53964087280.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/zetejizulij.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/e6ug0kesn5pot3977rosb95846/vizuzenikaxegite.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/bjur3ija25aa2sui3ihkqamkaf/83877211556.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075ced733076---25239805453.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/31682067915.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210723235315.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/bidulekul.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/zirajufifejarimonolatijij.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/18b8d92feefba57c99ecd6e9222b4a43/tetabakaxagosajeridikomok.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/pewutopovuximitodilunawi.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/zelalulagasivi.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/bokolabigaxibusitumaxis.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/gobaxejojimesudulinofek.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/xavodo.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/afd8a772d1d15ea85f76bef784914f91/jobiguwosesexezeku.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/86867697635.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/direluk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=mec%C3%A1nica+de+suelos+juarez+badillo+tomo+1+pdf+completoPDF 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_off0000ec77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC77 17644 bytes
SHA-256: 325a8e645d7638d2d3efc1973dcb3c75ef3eae4dda26a5d380685706c922cda4
font_01_sfnt_off000118d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D3 11436 bytes
SHA-256: a4439b7d497a98f3b34e26fc94d9d2df7035b2a203a3048846dfe38505c046c7
font_02_sfnt_off0001333e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1