Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2c193584bfbadb…

MALICIOUS

PDF

85.5 KB Created: 2021-09-09 20:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1b24c6ef22971940c45e8f5c3294c333 SHA-1: 0565d62fbe23f571a8184c31dbbd71b281b42e46 SHA-256: 2c2c193584bfbadb564443f3635839570a5eaaf9c28aef90d88eb136037eec01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://synerhu.ru/uplcv?utm_term=clean+the+phone+storage PDF link annotation
    • http://stylekd.ru/files/95092858651.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/23956678449.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137aeb8d7a79---95487819389.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/kodefator.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/rusonegomafaxabegomivo.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/mobelolanunorelujus.pdfIn PDF document text
    • http://krupongs.com/images/file/lojopowekonapo.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/olmcfnstk3um3na9t5rp55frv7/jimog.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/legan.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/30318773499.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0f093ec86---mowufefemuxinedifata.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/36147668097.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/gezuwesejekawoxuzesar.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tonetule.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/38930488273.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/tagaruxoditigozewikisi.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/vuvikenadesug.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/92906620632.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/519745197.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/1885902174.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/18953882922.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/xaxenetax.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/vomuxizozeferipezuma.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/96764121462.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/59714985985.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/27600811207.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_off0000e847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE847 18664 bytes
SHA-256: abe57ab89b4609824f1ff9012e6bf641768c6e774deb22ed5a84a4298c081b2d
font_01_sfnt_off0001185f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185F 10472 bytes
SHA-256: 5e2db88782f76e1d73fc7f49f6dadb02d2163d0c57482db4e9bc0d5331d9ee16
font_02_sfnt_off00013027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13027 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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