Malicious PDF — malware analysis report

Static analysis result for SHA-256 e75a96dd36ba58b7…

MALICIOUS

PDF

96.3 KB Created: 2021-09-03 17:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4dbcc10d2b6195ef9b5e78d8f1a415a2 SHA-1: 34ef861436bd99db4c03d0b93e091d88876df887 SHA-256: e75a96dd36ba58b7e30e81b0dbc4464af576970d2cde6ea609d6a38d93affbf1
176 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains a link farm hosted on multiple domains, some of which appear to be compromised WordPress sites, suggesting an attempt to distribute malicious content or redirect users. The ML classifier and ClamAV detection further support its malicious nature, likely exploiting PDF vulnerabilities to execute further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://alexhoffordphotography.com/temp/files/file/jodulixojogutabigevemu.pdf In PDF document text
    • http://paroissedementon.fr/upload/files/55604000337.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/52995000432.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/kodutavuza.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/37146345346.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/55353750463.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d966413df---kazoj.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/0f94c934462e8e7b7923cbfd844e7a02/85198934853.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca10d353e5---20576180299.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f506180063---24358993635.pdfIn PDF document text
    • http://consade.com/userfiles/file/sofodibetenibotu.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/31898199011.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744c5b7dd2b---zixolofogol.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/12143705145.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/1a06a26dd90ce3fe4703f775c7fa4039/90718806062.pdfIn PDF document text
    • https://hssanesteban.cl/files/gejomejuni.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/76702149609.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161270dc21f429---forewejipanoje.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070343ea4882---tamukadumubutix.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/rufadamewexufi.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210726230642.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f32e49031---zisasapef.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/zitasojer.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b89b58fb7---sotijabowida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=chaconne+bach+pdf+pianoPDF 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_off00011209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11209 10476 bytes
SHA-256: 702b3394a9edceaa5bf5b92368d7b1538cc2e1830d6bccce61ad7b8598df17ee
font_01_sfnt_off0001297c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297C 19104 bytes
SHA-256: d58edbad88ef496c23afffc7c885eb1fe80af04a5f591dbd62a2c8b67d8cfe23
font_02_sfnt_off00015b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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