Malicious PDF — malware analysis report

Static analysis result for SHA-256 6924077fd9a30822…

MALICIOUS

PDF

76.2 KB Created: 2021-09-02 05:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0c3811912377f485dea8892a8189b1cd SHA-1: d6ddeabc0be9c81eb9112f9c6b9457a7bdfff205 SHA-256: 6924077fd9a30822386b392900f1b45e3f58b5ce2b7d09980dc8375ac0076bfd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for executing malicious code. It also features a link farm pointing to numerous external URLs, many hosted on compromised or disposable domains, which are likely used to redirect victims to phishing sites or download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aurorabersinar2.com/contents//files/77485612112.pdf In PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/7299364713.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce6e526418---wuxujatifodowewozezib.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e80c04b2cb352db15ee866ae4498a1b0/kamiker.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/90011199513.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/d1a2eabf698323ed6567a0ff659c6972/ruvolonoxo.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/9984d989eae8e28095a5a8bac37f7c75/mabokazarijorusalun.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6e6c65613---vavik.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/26618283398.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b12850b44a3---79661518575.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5341a4667f---28132586715.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/38595560775.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/l89jldrl8460d6idv9qfbv3aet/sinemotodesitu.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/49779512740.pdfIn PDF document text
    • http://praguetransfer.com/files/file/32908595645.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/tikowazovolabof.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079168089a9c---noleseg.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/91586905538.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/vewesoxoripepasa.pdfIn PDF document text
    • http://pi-consulting.ch/download/povixefasigizejosafo.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/fixaxufobebufesedule.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b45e5961d4e---zufurisi.pdfIn PDF document text
    • http://sam-global.ch/files/file/53937112502.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/81894598341.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/8737681070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=is+everyone+hanging+out+without+me+free+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_off0000c46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC46F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC86 11216 bytes
SHA-256: debc8084886911a8ad46bb7c09e9555db47cf81ef7db5f77b5406922a95a3c02
font_02_sfnt_off0000f67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 16600 bytes
SHA-256: d73b1da60514b9b4c8c8f2a95aee57f3f7f66d977b1653f2bd40c59e696be7c2

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