Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd720a6f8dc2413…

MALICIOUS

PDF

87.5 KB Created: 2021-08-05 16:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 74424963d0ffdd2878b625d8ea1b7732 SHA-1: 4b764f720ba5513d54c1302a2e59f6e7a218b8d6 SHA-256: afd720a6f8dc2413543917e25689de3bfd056459f7f52acae8fe532f2ae11166
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites and disposable hosting, indicating a link farm designed to distribute malware. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to trick users into downloading a secondary payload. No scripts were extracted, but the PDF structure and embedded URLs point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • 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 http://www.maderas-navarro.com/ckfinder/userfiles/files/69906994846.pdf In PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/emlfkg1ebelescr2ouq0vpaov7/zelonavo.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/95ec77baa91fefb1a46ab1ba769a2310/vilimusowuf.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/9805600060.pdfIn PDF document text
    • https://pasarantogel2.com/contents//files/65213976222.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160967f9b34613---devasozifedat.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/f451992332c7c2e58798d520fa16e0df/fobasanesidasisawewow.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/lafomugumozanu.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/91617162833.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/zexojijuve.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c188a40c841---97556067522.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/diwexebokasovunagozegixu.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/doremob.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/9add59097b7e03516bc5f921e0ce24a4/pevejizopujulefibukod.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/er0n5qt8rv1dcfssjv6actkjj1/93285645135.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/36rvsufd1uk1kb6b79cvl83h3v/fixut.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9e47e995c---59947485693.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160754d91cbdac---4130645642.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab57e3aa25e---tigozebutubube.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/15999628474.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/60743960196.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/14712632111.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e788bb5d8f---fetipegez.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/485a27e6e61e5d7fff78f1f2d7ded090/mebefag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=oxford+current+english+grammar+book+pdf+free+downloadPDF 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_off0000e9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BE 18300 bytes
SHA-256: 2bf2002ad0b15396d89102a09e4887a7b139281494b86fbf2b189bf3c623962f
font_02_sfnt_off0001324f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324F 11612 bytes
SHA-256: d18976a28b30d452d87739deec7e0550066226ad2e147fd9693d321d2a8cd45c

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