Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd96e0974f1981b…

MALICIOUS

PDF

118.3 KB Created: 2021-07-24 13:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 42232d26f02abbe373404a0d952729fe SHA-1: 26a7d748419808627e919dc3daeab638bb48f6c6 SHA-256: 1fd96e0974f1981b1c0940244a530910ca2a29cda19cda4359921c3000f89316
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a link farm pattern indicates an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8959

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 http://hnsunnyfood.com/d/files/jamafular.pdf In PDF document text
    • http://massimosusto.eu/userfiles/files/97127687753.pdfIn PDF document text
    • http://huimao.com/upload/wijekelukozaga.pdfIn PDF document text
    • http://greenbrier101.com/userimages/tejaxawiveluxisex.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/4849237947.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/95319550886.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16086c5974fb52---gorutamowibixipitamidipi.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/12726931521.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/tobiraxunifabidil.pdfIn PDF document text
    • http://retrofotr.cz/files/file/96364290018.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cdf19fa81---mofumobav.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607750f00359e---fuzanuditi.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/mexebivawim.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/ac75c51a2eeb1b4141e4067c5313f7e3/75655374868.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/bolalojujuwapi.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e906d25fe90---tifidezomaxiserenozov.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f89d3d9bd---jetoruxawowemenatuwore.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f99e3e76049---80437049644.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160af6b1d39c0b---75925725626.pdfIn PDF document text
    • http://ahchala.com/img/file/gebewebabuwusifetunutome.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/xaturefokukofufemiwo.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/zuxira.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/74963839460b72e20b3363.pdfIn PDF document text
    • http://synowka.pl/galeria/file/50624822130.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edbd123fe40---wizuvilizerev.pdfIn PDF document text
    • https://isosklo.cz./uploads/2401027821.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870e9d6dfcb---36734137054.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=progressive+era+study+guide+answer+keyPDF 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_off00016c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C91 16868 bytes
SHA-256: e0d1f77b9617d5b0bfcfdf96666b812f3f8cbee3c8cb22c35a154951dcfce24b
font_01_sfnt_off00019818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19818 10836 bytes
SHA-256: 154b6d87e333233081dd3799baac9b4bd617fd6f5312096fdf37e3f6bc694964
font_02_sfnt_off0001b12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B12C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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