Malicious PDF — malware analysis report

Static analysis result for SHA-256 6674834ab1f167bb…

MALICIOUS

PDF

76.5 KB Created: 2021-07-25 17:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 04a981e912f66487d6af3996de1fa6db SHA-1: afdf240ce4ec6dc9b482d06c181c91a511814ea5 SHA-256: 6674834ab1f167bb222bcfdc6f81efa425b380511e78270c4071ad077a6e6cfa
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised websites and disposable hosting, characteristic of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, further supporting the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/c4734c410346a906dab0572a5a642491/14927094894.pdf In PDF document text
    • https://kingdomofgodmn.org/userfiles/files/minoxegedenikabetixomikoz.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/zoren.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0499c5c65f---zowufidavumabavaxegikezo.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc50e6285fc---sapijuvata.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/21342135401.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/jisudakuw.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/770f6c8dab5e28f62c79a13a1673c487/65327684703.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/vatoridejavatijesexuga.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/eb469e09718046e774838365e2e72c3f/30177229266.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00adb21421---soloxeja.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/72303442021.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/82855980511.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06e11288b4---tadinuzolorefibetugifuno.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/xovaxijixolo.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/f3cc0d60e56d67eaa465fcbb2751939f/70334114340.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/27543031742.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/pozopuzibami.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/93cf71ef207132993a60ddd54f140fc0/devite.pdfIn PDF document text
    • http://skncn.com/u/files/36820173755.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0sme81eri33kerq9hbfdbtlk02/sawipixovimomobo.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/sapepitujafolavavavixopiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=vb-mapp+scoring+guidePDF 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_off0000cae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FA 10956 bytes
SHA-256: d97137c193cc9b2fe5d83177bf98e2fd3eb770c5f507d9213a2516641b261217
font_02_sfnt_off0000fbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFC 15964 bytes
SHA-256: 277b3b7ba1ed96587350947a90ec7ab09d22446bc1193615a2c65397f491ae72

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