Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff687a57b8c2c9f1…

MALICIOUS

PDF

116.0 KB Created: 2021-08-20 17:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 80d067deecdda0be1aa5d2277f9f25f8 SHA-1: d1fa322e8ad70d03256a6ea5993576ef7889717d SHA-256: ff687a57b8c2c9f18ceb10616915abdf0aa111d5d82e47de90f2669be25031f0
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://archism.ru/uplcv?utm_term=extremely+loud+and+incredibly+close+chapter+15+summary PDF link annotation
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/4b13288742b57a908863c977e8ebb922/zikumuju.pdfIn PDF document text
    • http://scholl2021.com/clients/1/19/19bca4f76d5065ca3bffbfc1c67e7925/File/gonewikugagolo.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/nasafegepekidafaruzupazit.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/4536095505.pdfIn PDF document text
    • http://citra.cl/userfiles/file/revobezaj.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c3bb1fdbfd4cf0d5877697980adfe8b7/21320183635.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/e249b4dc311babd2348470750ad4eacc/60033379712.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b287c933494---36810115772.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/pubupofasivosojopuleropef.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/36990878279.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/wozumevifepupufi.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/42577728624.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/zopanojuzuxiravazexov.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/db5b6b21f558ffde89fd69b009f5cb6a/48567346777.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/v897a6b1u18nmbifleqo78csj7/pizefe.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/jazaruw.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/togojifolep.pdfIn PDF document text
    • http://chapelguild.com/images/usr/30439153607.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/63fe58c5c16b600a43d8cc47ab59c5a5/papepipo.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/suguposa.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df0e4c65fd1---tupimiwibenikezare.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_off00015b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B46 19772 bytes
SHA-256: a8d3eb09dd0a3c42ef6c68ed2c85cd5e57371c2d06809c4a03d957d29425680b
font_01_sfnt_off00018d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D22 11404 bytes
SHA-256: 3d7875d1bb4116c4ff3e27e5e184906db44ad0f8484f8a4ed129e1220e9a4859
font_02_sfnt_off0001a7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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