Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7f4a7ff580002d7…

MALICIOUS

PDF

95.5 KB Created: 2021-08-01 00:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8123fbd2b2e73f8738a609a962752b9d SHA-1: 696bfbf2d719fef6f25c9270e4499723a672068f SHA-256: d7f4a7ff580002d73428172ff0aff1c4a93678b0c5fa02469f96b65e947f5d5a
156 Risk Score

Malware Insights

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

The file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm or redirection mechanism. The presence of these links points towards an attempt to direct users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://alpha-th.com/userfiles/file/78096683497.pdf In PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/dlm7dcg49ji8qbbmj6fk3ppbmp/fuxafi.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a53ce5c6adc---bizuvobupat.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da5418ade6---butitodejowob.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/udkfpv8a546dq0oqqkf1sececg/semawuniran.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/d7244fd8ae500669ef1b461b23e4a4f4/redexidetovazode.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/33940238708.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/ba3285773d8234ec31a771ef15fa3f3f/34492530760.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/litavugoruwobolibe.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1dae61b662---volibosinutog.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/gavaxavivigi.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160be5c3bee952---71699457540.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3340dc09dc---97111864582.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/nobulipavozimedipap.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/lasoresidutaxudojana.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbd4578726---90012721271.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/f8f4ccc75b648e8eca00774cd4af5f90/jozabagife.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/22709968926.pdfIn PDF document text
    • https://ekransamara.ru/files/vobuwoginupiwetoron.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/kavegutikujovasapixevu.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161048bafc660d---38950180137.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/215f9fa8a65db1406363931763f06882/6836049269.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=extra+questions+on+all+summer+in+a+dayPDF 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_off0001122e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122E 10856 bytes
SHA-256: 294403df0f9f97a34b4946b8f461e2e1a26b65856d1f04164246387539f92761
font_01_sfnt_off00012b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001431f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1431F 17300 bytes
SHA-256: e62d5272545cc5cd8e78d8fdf9a9003c48138f8111961711e10f185c226c820a

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