Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bfd8e91b24327a5…

MALICIOUS

PDF

89.8 KB Created: 2021-08-15 02:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 13a49df7209313f262a6b6beaecf08e3 SHA-1: 89d4a510acbf00a155c199721fd26a067591f79e SHA-256: 1bfd8e91b24327a541a5403131be984502281896759903b4ee3d1e66c3bf3dec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and the nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/fe6f9d36d42ac760df24bffcfd256fd0/kanoraw.pdf In PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202107050907331617.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/84166925.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/9p44ue7a51lqs415cpmg55ajai/32804177781.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/lafimo.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/917a0d6d54b711fbb7c8536c5cc0795a/49694059674.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/69090804694.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/xesapafuzesegima.pdfIn PDF document text
    • http://dges.in/userfiles/file/54351166216.pdfIn PDF document text
    • https://kleinimmobiliere.lu/userfiles/files/30620162748.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/ranov.pdfIn PDF document text
    • http://lowchens.org/userfiles/file/80885876053.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e91d5467f---86122314292.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/k21je1jbjj5vha1k3tvtlgf240/fubatededamumamasulipum.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/gireruzupusonibu.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/xisujemarumowomader.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bee9da4ba---zoderawoponejexul.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893ca1e29d7---tefejexawuwivuxe.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe2bea7e67---lunelakuzulumepabujir.pdfIn PDF document text
    • http://yuhongzg.com/d/files/lakuwidofewazabika.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/88ec247d1ca229b610784463bbba00e7/lajekegavomokakisanekixu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b7f3af0cb---89009306120.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/mekesezudegekekanojupujax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=henry+cavill+immortals+body+workoutPDF 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_off0000f71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 17380 bytes
SHA-256: 63142ecf233f7ff205d7a3d487dbebff6682c3bdc6775e3fd3777de73920822e
font_01_sfnt_off000124bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD6 11120 bytes
SHA-256: d17e33679aee7e512dd7dbac0dfce2b82759ca53cd229c2456f0e4b096b643ff

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