Malicious PDF — malware analysis report

Static analysis result for SHA-256 48630c29d4585e87…

MALICIOUS

PDF

113.9 KB Created: 2021-08-18 21:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6c7afbd0ca5e3bb0a21bae87e85bfd53 SHA-1: 0e0d177a168f67368a9eb0b903468685f9ee9d9e SHA-256: 48630c29d4585e8734aef7ef24f909aa062a26c3e31ed9dca5d4e6bbc881f205
164 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=how+to+farm+star+metal+conan PDF link annotation
    • http://wib24-admin.de/uploads/file/lurotimaxunesud.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/924985397.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/2d60c069ca590d79aadfafdc331c7cf3/31727304725.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cc86af00836---70832503638.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/u8i5t1ptugmaae6hm15t7aulq5/koletanomiwav.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30d72ede40---porixisitoximad.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/wurab.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/93e7c1e203f4c8a3ca2445e09000f383/93769586380.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/u1m3bi8q79hg5c0egfhgb0noat/tagoguxaxefumaw.pdfIn PDF document text
    • https://kopari.hu/files/file/16585154693.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/59271240038.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/79514438709.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608172246c4aa---fivisegipodovavafiza.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/92516853040.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/6343404833.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/53954643532.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/1p14vb3sbj4kf8rp2eiij0r0ur/27471064139.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/96802699156.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/nidapavaxilumuberolisu.pdfIn PDF document text
    • http://esistore.be/userfiles/file/kafagutoxuwifabef.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/pukipede.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/91736062751.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/pikamorumatovus.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_off000159b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159B7 18012 bytes
SHA-256: b11c3bfa9e7d92a474194f3bbb1034bc84b109c7908b553d3e6d4295e0747e24
font_01_sfnt_off00018957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18957 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A16E 10480 bytes
SHA-256: 3c2970d8b4fddc546d567f85d1db96cf0a2c8c2b979ec43d3941830cbaff41f4