Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef65f8d3d5e30ac…

MALICIOUS

PDF

102.4 KB Created: 2021-07-16 07:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 59410e7165511512fb640498b1b70cd7 SHA-1: 620d1ef88973050ce3bc245e66707bc9f26e08f7 SHA-256: 9ef65f8d3d5e30acf28dd1752857bccd2d12c3437dd969c6b9a874c6847c365b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a link farm pointing to compromised WordPress upload storage indicates a malicious intent, likely to facilitate the download of additional malware or to conduct phishing. The ClamAV detection and ML classifier further support the malicious nature of this PDF. The embedded JavaScript is a primary indicator of the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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 http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/5tg0cornvkjo3o2lqinecrq24d/74623368527.pdf In PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a802b596f4---23658385126.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/97564602260.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f48e2bdcaef254fd186035b0a03908fb/38488204845.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/xurebomuvamavutanabi.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160881bab701d1---1592377362.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/t4pt4fguragboktn4mbjhicnbb/vuwexexozepodinawekipex.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/dodulorijomijajojesise.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/94188492807.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/b6e768d646cd742577247c929c8f59af/gekivepeko.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/watoxaripunitip.pdfIn PDF document text
    • http://poorclarescork.ie/images/88325005863.pdfIn PDF document text
    • http://mcleod-bobbitt.com/clients/64742/File/9936821661.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/semutuvaxojo.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/tezojotepiluvus.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e1c678b4d2f227de89a77b45aea0ec0b/figukageragisuvovoxa.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089dd51386fa---gugaxito.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/7c57e8c7330fbefcf5352f5f8bcb5e58/zowikoxasesiromijaxoke.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/pezozitufowijaxejixo.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ea444dd4a---59676935610.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/c013939d9f57a0d8d92dce8bed8f5000/85383870172.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/88219004074.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/3c8iem017eouomevtj4geqqc6g/rejewirasafo.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c91bc3c3b---fegov.pdfIn PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/donegutakevidixawafazuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=heritability+refers+to+the+extent+to+whichPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C2 17624 bytes
SHA-256: 6b45a4407055ac416b00da1d3cd108d2f0935d8ee4b27b832dc58fcf43f855d8
font_01_sfnt_off00014344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14344 16108 bytes
SHA-256: c89ee32484f924dd147b850a24a3beeefdb8a1d955e484275e9e38f3dfd593cd
font_02_sfnt_off0001588a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1588A 10864 bytes
SHA-256: 92ef1b633f6f1b433c5f37b978c3906447a4c076c62f5ba2f18827c7ae876239
font_03_sfnt_off000171ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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