Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4cfca97f10c695…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 20:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 60cb34e773293e9b250e98162034384d SHA-1: 3bcce91741f403efa1fc9ac0633c89ec7deea9a3 SHA-256: 8f4cfca97f10c695569c2e911ba6ae60b252adeafaad2f518a2f3cfa09b923d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to compromised WordPress sites and are structured as a link farm. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. The primary goal appears to be redirecting users through a series of links, likely to a phishing page or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/8fhne5rmbknuunn6rsflf6fj8d/25256902113.pdf In PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/49384999150.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/jijuzavibilatepeb.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/potapetefifiwabuta.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/p9o47faat8e20m8802u6tllid4/potisosegof.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/3h86m10g5arl3msgmpr6kk6jrl/miwugurenekajuxilajuki.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/47b8176bdea3c1fe5e80af3e220d4291/92818108618.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/tde7ctm95ppsmic3ktvr4mjqcq/xurulevurezuzaxara.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077cb1610e86---tefopalogisuxowajevujirud.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608afbf6e7c74---31498248195.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/vugotidira.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/vikemegifif.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108781705f25---53237109573.pdfIn PDF document text
    • http://sport-way.ru/img/file/zawupakarerulasuganixiga.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/wadidujipagudetivovowe.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/610e3e7aaa85ea9f6ee838cfb8f64898/tumorapulotafemobimufosi.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/xapoxedivovosuvi.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/fajapek.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/ua8t7dq4k3j54h6ohbm955oi8t/21708976065.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/493814551.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd14df0a35---kavomurugabomavapigibe.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/noguxupadukakipiforilafez.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ogqsvnj1svd0cuiibo3u82em33/desiberivoz.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/turulujonuriwomalibozi.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16073ee5296f82---65851114706.pdfIn PDF document text
    • http://uchid.com/uploads/file/bogenekiwokiwumup.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/160513131510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=medical+physics+books+pdf+free+downloadPDF 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_off0000d54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54A 11044 bytes
SHA-256: eae0338b3975dd88bd2618474a409880e2fedd5b634b23af02c84d8dbcdd197b
font_01_sfnt_off0000eeb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB9 18048 bytes
SHA-256: 1fb8ff117058a77b24b9e90e54e9d13103e64011a9fa9c2cefe6206f38f381b0
font_02_sfnt_off00011e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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