Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ed72f2d9718dc4…

MALICIOUS

PDF

88.3 KB Created: 2021-08-13 21:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 559f02ea8d384d1b5575a33c2235e4dd SHA-1: 5947ca6a161c966e6affdf432195d1688bb5fb63 SHA-256: a6ed72f2d9718dc4b62706f63dc1e8dfdfa0f28020eb12efb89046e01134f6a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs pointing to compromised WordPress sites, specifically within the 'super-forms' and 'formcraft' plugin upload directories. These URLs are structured as link farms, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of these compromised CMS upload links indicates a technique for hosting malicious files or redirecting traffic.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/939a379bc89bef415cff7894436312bf/vudigefi.pdf In PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/1pcg1s4qvbs09pm764vsn7beq3/57275189930.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8660f38c67---19986901503.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/dakib.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/76d95ff948fecf96e90057378784dd43/84372085833.pdfIn PDF document text
    • http://ibb-online.ru/f/file/sogivivorenikivusozu.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aab792bd172---mezebebawanemezaba.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/49485908904.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/p6boqi7hpm0ilnntlqd7h16hrd/tipusoreguf.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/2d6dcf74f237fd707cd4f6ba0506231a/ropudupufimixelovumo.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/vlg4o095dcqdpistmdbk7acenk/97712331937.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/madafetamifo.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/442c2127b179526932eda7424e881f7b/tebimudatosiletisuguso.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/59308135886.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/22821316421.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/aa6b1df9beb5fbff99743cb924075b1b/10799315030.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841aa3eb35b---748236015.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/58788598394.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/nijesofutilalenuledim.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/1d33837dbaba279a4b1b6433937dbec8/81881505331.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdde85c3e4---filobutugi.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/aafb478262d83fd1a10c5d51682ca05b/wikavijasovupuxemimed.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/62535131150.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/gejetenepomumojedorutipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+respond+to+a+complaint+nhsPDF 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_off0000f548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF548 10856 bytes
SHA-256: f53bff88b13d006a002b773c0299ffa08d2e6242b27cfcc93f1f2a3e6653b834
font_01_sfnt_off00010e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001263f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263F 17116 bytes
SHA-256: a4eb259d6ab86dbc65f6e9d231713d45c09764987b928d7366aaa7ecd674e7dc

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