Malicious PDF — malware analysis report

Static analysis result for SHA-256 494adf718efebcf4…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 12:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 39995ebd1b4c543e4fc27672f46b5c48 SHA-1: 169f1f65b2b68f7812aac23c87fab5c746b3f446 SHA-256: 494adf718efebcf409907973ba74b4ee852b6f176cb65df8572a8a7e74d9a97d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/05255a701bdeed22ea6d2e5c4a723092/31330014553.pdf In PDF document text
    • http://mwflower.com/upimagesfile///vipunokovuton.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/5176521072.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/tinosapujezosarupab.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/xasupaj.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/kevovezarakijitegebebin.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/25164640588.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00b42eebb1---paxuzaselagilire.pdfIn PDF document text
    • http://nenorm.com/files/files/kuzubofubetenasuvunowuva.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/larewuwoduvojomamaxe.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/laredadunalaxenijiwu.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/9d4f8ec7d5627d61c1a4e6484629aade/sajabojiv.pdfIn PDF document text
    • http://air-ned.com/uploads/files/5785326715.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/12407024662.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/fapemajuranisi.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/f46b8d82899c1668c5c70bc6bebbc0b1/50648401321.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160838d8dce956---xamemidokaxujapetezarav.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2d226eb17---bezazenatomexome.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/dajuxeva.pdfIn PDF document text
    • https://quasar.mago.ro/ckfinder/userfiles/files/bonawigebuguzigajikov.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/22966451509.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/39782746420.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/97507326234.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/bimunimuso.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/38824149207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=les+differents+types+de+lancer+du+poids+pdfPDF 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_off0000d9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E3 19384 bytes
SHA-256: 43235bd28c556324b25891031dd79b383ecf9d01ab89b9264926bd7c1a6d2c3b
font_01_sfnt_off000109e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F8 10784 bytes
SHA-256: 3e89d82cf3098fd46dee1cf1d6ed71adc9a309821b644459e2374fc394e3a724

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