Malicious PDF — malware analysis report

Static analysis result for SHA-256 692e4a16db95f53c…

MALICIOUS

PDF

87.5 KB Created: 2021-07-17 10:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 23529d77b2d5301e79a34a693955b5b6 SHA-1: 362942fed8af6fd118209902f1290d158bcab58b SHA-256: 692e4a16db95f53c7a9253e990ca23520a0ed06aa070441c63de81c9f84174d3
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics suggest it functions as a link farm, directing users to compromised WordPress uploads and disposable hosting sites, likely for credential harvesting or to serve a second-stage payload. The presence of MFA/one-time-code lure heuristics further supports a credential phishing motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://tangentemag.com/img/file/77717483006.pdf In PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d618d539314---fumidona.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/bbb6d9bccf3dd24eb5433697cb533110/33638613934.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021061408261968.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/mifebe.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/79859188406.pdfIn PDF document text
    • https://rcot.org/userfiles/file/31082769156.pdfIn PDF document text
    • https://bursajp.com/contents//files/72152808048.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/22010707536.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0f4e7ef51---93957778505.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/h27h2os1hta10lh8mnhihobo07/logubidejituv.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/fe3789c65461a23c458c567f58dd8c90/durijo.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee2ab0e350---37654986157.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a41c994c1---21170586179.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/wusogovemiginivogobusoxi.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/44972606268.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/99306969257.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a802d41280a---tenuranuxezizebemalij.pdfIn PDF document text
    • https://chornakorn-packing.com/ckfinder/userfiles/files/revilezejowasunajedaj.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1249d1a25---88404128093.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ed45d27abc7---83339480566.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/40897083467.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/abe48vr5tb0fila9upve24o6a5/zugileviwes.pdfIn PDF document text
    • https://5uempat.com/contents//files/17545108583.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098b7695a50e---47948004377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=free+10+uc+in+pubg+mobilePDF 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_off0000f187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001099e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099E 10680 bytes
SHA-256: 46f04e26561019fb7e6887645fc613d836e34cf58bc8402578052e870149e959
font_02_sfnt_off000121c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C2 17796 bytes
SHA-256: 1a2c06c85296296bb776b6e03fb61993a11c75f067b3fddb9df25db2a546f7e7

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