Malicious PDF — malware analysis report

Static analysis result for SHA-256 5447b7d2cebc51cc…

MALICIOUS

PDF

79.0 KB Created: 2021-08-16 00:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 75034db74e7035dce5f0fe756d8e84e0 SHA-1: ada76d2fa458674d1e86d82c544317d9b15c939d SHA-256: 5447b7d2cebc51cc8cbac5040dc61447ad5b1db221280aff3589e17e5a7fa8f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://broadviewlibrary.org/uploaded_bvlib/file/wudajufapazupefosasaxu.pdf In PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52653809711.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83e3b663ab---jitujebesopazekesafife.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/5878422656.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/25127402988.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/523nhkh9hoi96gr7nlatmj1erb/lawebosiwefuduvar.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/4c79096337c4ef1e3c529ead51f08725/zulezasupevifasetivurux.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/9803567582.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/ruvodijunizesisapuwu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607db60d39a5d---29765837561.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/97622951512.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b883361d30e---13136479632.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///nawadefafev.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ce76f16d2---daxuda.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a146973e6c4---ronimu.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b3c4f8887f87c8c1fbdb9dd61dabf79e/17940944265.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/lovok.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c117437fd5e5cada3dd0f3045993e675/xejatowebe.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/digofejupezijorejomodisa.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/8b3ce2f827afc0435eaf1fc4ab0bd87e/luwazas.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/8218adf99cf08aee5fdf05a1c0fcb823/bemutigenetusubulenimuvor.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/9r1ddbl6l1e5uboedv0g9nck85/tarona.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608799bf2c304---vegilugikeziseguki.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/begarenogawufagijev.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/navinujudagegadajapid.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/xulom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=roger+internal+conflict+in+lord+of+the+fliesPDF 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_off0000d40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40D 16056 bytes
SHA-256: 6d11601a0d44ed14e9f153bd30b72b24f6fa98fd08a3457756a1515548678de9
font_01_sfnt_off0000fd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001154e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154E 10800 bytes
SHA-256: adfb8683fbed272897bda2614915703a8c0d6553b599b68d2e90340abc550efe

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