Malicious PDF — malware analysis report

Static analysis result for SHA-256 9edd6fff15b2a30c…

MALICIOUS

PDF

88.6 KB Created: 2021-07-21 08:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 73b527065fa148e3f8761b384e86c370 SHA-1: 80d4fcf3d22e9cc587dba75fd91308d269ebe68e SHA-256: 9edd6fff15b2a30c1879244e178b779d4a9fe2f99afd36399f0f077f28cca0b0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of an MFA/one-time-code harvesting lure. The document likely exploits a vulnerability to redirect the user to a phishing page hosted on compromised WordPress sites, aiming to steal credentials or session tokens. The presence of multiple links to disposable hosting and compromised CMS upload storage further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/3e6a5df16f30cfdc070a2c4e941f16cb/zurimi.pdf In PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160952c3cefda8---41255449645.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ba31c57996c---10186243148.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/emm7fhptgsv5im85hvonlt4886/ritodirinojiz.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077468adc093---60373033165.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81828280397.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/8cb670d5fb047a8758e68657593e61e9/limuweb.pdfIn PDF document text
    • https://murderescape.com/wp-content/plugins/super-forms/uploads/php/files/94fbeac77fc563992b117b0731d31877/fawuxavulobuxidolaf.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3314101cf---rujasubagasakisazepeboduk.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/18576727237.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/68884507845.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745d2da7bb8---37961394620.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/26594171721.pdfIn PDF document text
    • http://fundraisingwebsites.com/clients/9/96/963d931f30a9d2280975e71a7f923c96/File/kitimonuwiliragizeruxos.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/19264297448.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d73813637b---jowudalajuxebevowukonolu.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/11850923294.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608532d46cefa---misovumifizoxuwe.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25804f408c---xonadunuvabamulasi.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/kesasarebes.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/a330bebeae7c294d7b6f2c1ad5142e0f/10826095578.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160848430ea340---54106693470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=who+makes+adsPDF 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_off0000fbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC4 10156 bytes
SHA-256: bac19b5aa7c080cb4fb6da1f3d0985fa5d6c0d6034a349deb93283c9a7927ec1
font_01_sfnt_off0001128a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9C 16684 bytes
SHA-256: 2fddb68bffaba71d630b13d579ffacc49f972f40248c1920c750dcd010d0139d

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