Malicious PDF — malware analysis report

Static analysis result for SHA-256 0828fb43ebf6b3ac…

MALICIOUS

PDF

87.9 KB Created: 2021-08-11 04:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 60b3e7d6d8a99a4d33a7bb1754892a81 SHA-1: 99ecf32e6043707fcc4e62cecec8d0fd10e319bd SHA-256: 0828fb43ebf6b3ac43e791e89499d318557b0aab0651e71ff9bd54c29a161b31
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary function appears to be redirecting users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=math+exemplars+grade+4+pdf PDF link annotation
    • http://kelvista.lt/images/files/bivuripogid.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/3881202939.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/7543553758.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/zojosopujagupiwusa.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785305b4177---funedumixedirezed.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/68564340995.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/64191982152.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/vegawupagaboxujitinub.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/molorejeto.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/hpf0v9huru680iei97ma3feirt/63481548472.pdfIn PDF document text
    • http://446888.top/userfiles/file/ropabijeduvefawurakisob.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080da10a16ab---15047869457.pdfIn PDF document text
    • http://df-foundry.net/d/files/fepowibekikinofoxorak.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/10580124297.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021052601272270554.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace29159646---71518345784.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e6b279cdf---jupiwunozixodijofumagase.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/12496543420.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/85baf2e34dfb8736e674cf1cb5941679/pazufaduzefarapewejej.pdfIn PDF document text
    • https://langumeistras.lt/i/File/58571979663.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/19c63ce191ed9260392dd9f394f915c4/sonofe.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/nowifolenokesevukemibisug.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/17274af24e04a5ff44639805c623b705/baxijumogewapikelogonuvu.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d51191d7f9---67123806674.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/lufiruzebag.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_off0000f579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF579 10800 bytes
SHA-256: 39e74c249d8a4583dbc37641b0cf0554cbc11b581c23c8216979a33043f0e213
font_01_sfnt_off00010e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001264b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264B 16520 bytes
SHA-256: a3f3724663cb32bdded32445dacd026548327e627085ec7049b86ab2d212eead

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