Malicious PDF — malware analysis report

Static analysis result for SHA-256 882334aac81d127c…

MALICIOUS

PDF

82.6 KB Created: 2021-08-29 07:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 31c870afdd0827e98cec8f319bf6188c SHA-1: 40b2d4385f2a17e2a960d5005a62dcaface8059d SHA-256: 882334aac81d127cb2385436502c5074bced4abe9faa114092be6874973e4286
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm, likely designed to host or redirect to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, possibly related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161196c93f1095---6663135853.pdf In PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/qnc5atbncp3uqhmn3m04j76et1/meroxaneguwitewokekas.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/dapazus.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b844cc18313---95511820363.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf59a47bc9b---dazavagik.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/jejeruxarelunita.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/12982940649.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/6969745435.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/nisuzezawuwi.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/21255071740.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/37804966784.pdfIn PDF document text
    • https://bem-sa.com/img/file/sanotabukaloxade.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/xazumevutikitigopikuteluz.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9afb7c78fd---kuzitebonuxeraxuzedizupav.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0fdd1b355---pesopapamapipizukawujej.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c67c94cc230---koruzubunininenidomog.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/kigijosifejilodolanak.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/f9f3fa38dc3a99cf4dc83b5f74f41e15/rakuwe.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070b06b29719---vovukudowefufajula.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a27dafb74---fezatowofiwifoxubefogan.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/59077178075.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/s8sr5cir0g8m2lq635l61rtgb8/wewudefa.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3dece1bc9---55374478783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=trial+ion+productPDF 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_off0000dc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF474 10272 bytes
SHA-256: 5fb9681709253d073ea42c389761a479163ca52bdc7cad16fa8132971b917f3e
font_02_sfnt_off00010b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B95 19132 bytes
SHA-256: 90aa5a7ef51afac7cb4ceff904a0fa007412f388005e64a0473e5d19c43b5ff6

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