Malicious PDF — malware analysis report

Static analysis result for SHA-256 279cb32dd1296673…

MALICIOUS

PDF

72.1 KB Created: 2021-07-13 09:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 879a506da7f4c1bc9b479b6fdf09db07 SHA-1: ea68da0d0c100e67cf03a0df98fcb3938a766b41 SHA-256: 279cb32dd129667328d4a9ed0152bede404aa196cfc67869dab15ebf4adf05b0
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the attack pattern of luring users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=fitness+certificate+for+government+employees PDF link annotation
    • https://rinducm1.com/contents//files/92784477786.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089a9b664d76---zonaboxetelumawoxowal.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a7628cccf84---66489936400.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/h3stpld4a0asrj87jdllgr1jig/66957838573.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/foxabadu.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f30329700---monuxobilareju.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba09ce2b8c---6047896625.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/83811625661.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/36177777826.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0708371f1---91843084339.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/667684475.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4d31af7e5---65906979619.pdfIn PDF document text
    • https://yuss.it/file/77913730108.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/bebupifavigi.pdfIn PDF document text
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/62411771349.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab3cf8815e---jolatumodewuripuj.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/e6833c4caee5c2059fdecb09b8ba00dd/tanisajuwukokeberajasabu.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/kuu641bqgre2a39p47m8to80ed/metik.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/64752492181.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2b119e82e083f80e4e219b9bae632e31/94171128694.pdfIn PDF document text
    • http://cmepta.com/clients/7/74/74ea2f63c40943e6497cbf70acaf7c81/File/dejesokedufibaxopaluzolu.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/woxitemonokoruripeluloli.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/97b7c6cc44692c29b1c861873c8da3ed/58417609295.pdfIn PDF document text
    • 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_off0000b9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DE 15520 bytes
SHA-256: d4c5c5c5971a15f7fc86e5bfb3d6a9bb7fef93e953cd76899f7900d690f0e5ce
font_01_sfnt_off0000e189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A0 10980 bytes
SHA-256: f53b53c1c36df3c678def574c0835559550f21f474b42fa452f9fa7e8b413a07

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