Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a044968059b932…

MALICIOUS

PDF

108.4 KB Created: 2021-09-03 06:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b421e26b727d0dba26aa68682728f19 SHA-1: 44a57998328d5105115655651049224f2ecbd96a SHA-256: 97a044968059b93237d132871dafe8bc9b18d27841c85d0a12de9053480e1ea2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are designed for SEO manipulation or to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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://daisytalavera.com/userfiles/files/wezajutegivarumawekoven.pdf In PDF document text
    • http://bawaconstructions.com/editorData/file/11745363874.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/gekogorirajidaduvutefa.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613017f784f15---9927860450.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d107f6c8c4---jubukejizugevugizemexari.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/vaxivunuwasadafebowuka.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/17590609155.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210821091623.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094354ca7426---morizibewotuvoxepowuzaje.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bc8b3a9f17---20118448245.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160adc3d5e7313---2090369025.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b0dc0d8e4---pobobusunizonagaseb.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/37750437419.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/8d7098f6251f54c49ceabb1f25f97d8d/58793023746.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/12760404460.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d39027ecd8a---suxopivesuduzenugowodere.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/26101301839.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802ed082710---fadebawiwiban.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b83a157347---vidozefemubamavajoxo.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/sm4pc816b1dnpcupipit9fu78s/10437869522.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/136f05f2642eda600959deec16530aa5/bolepab.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/j5ii2l95nmkjvpqp4r19hd0ac6/sosaj.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202108162010075609.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/3249585098.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8d8eb8a0a---94121562092.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/7c33de9b9c130ef0f9980ecbf1a31986/13624334621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=orwell+books+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_off00014354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14354 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B66 18704 bytes
SHA-256: 5240e3af10803ed6b5c325428de4e8028ee8c1422568664fcd26dfc4d8907fcc
font_02_sfnt_off00018c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C4A 10380 bytes
SHA-256: 90b0668cf9bf4daea69161df145c27ba14d6336f901d7ab633aea2b2813918cc