Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae080bc827d4c06…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 09:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 14199cf2df857fe27bd37c217c419d04 SHA-1: 443966f0b2d5fb2459ed742bc34e40080137f282 SHA-256: cae080bc827d4c06d6ecb9c97d296c4a308c29b2804977cc1aac0e1a1980c944
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised WordPress upload directories and other disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware. No scripts were extracted, but the structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://nirmalujjwal.com/public/ckfinder/userfiles/files/korasunepikalepekamekivix.pdf In PDF document text
    • http://brandiassociati.it/userfiles/file/64495176778.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/xebokugituranitinozojik.pdfIn PDF document text
    • https://motoralbini.it/files/file/larajufumok.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/wewosezofaniru.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/wigigi.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f861218ae1---kegemo.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/tirobiravutonibumopojevu.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/67298149318.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/8006984429.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161410edf7f48b---13413594621.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/74086309441.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/witajemazirenepimofifirar.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/33836662404.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e4f544ceb---gepumifenexugenije.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/jesumumimexolekerofunafi.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/54050810642.pdfIn PDF document text
    • http://zjgyuanhong.com/v15/Upload/file/20219131197954.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/13106566185.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/87883117964.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613437c5d636d---26849347625.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/66718299731.pdfIn PDF document text
    • https://aedwea.com/upload/foto/nujogipubelize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=hot+song+piano+tiles+apkPDF 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_off0000da0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0E 10412 bytes
SHA-256: 1e3d4a9364cf8dea49621a4e02c2741116ebc650e9e9a546b1d68963d89e1e25
font_01_sfnt_off0000f1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D0 19092 bytes
SHA-256: 94ba73039f647f27ebcd6c49231953c589a357ffa423e946811b5518eabd83f4

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