Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e9938ddc90c706…

MALICIOUS

PDF

75.4 KB Created: 2021-09-07 11:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cc7779766bfd08c29e0a977246b59d05 SHA-1: d8be5cb311cf6079e82b84e102cf537e15d28205 SHA-256: a1e9938ddc90c706d673304a606d0ab15c2d2d310a39714be5f6b0b56acab4a1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms. The presence of these links suggests the document is likely used for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607778361bf4d---wojuxitidawamo.pdf In PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea274a73d8---94117756003.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/xezar.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/18646602817.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/vamabegijipegaremo.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607832b382512---xojazokinobejade.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f9302a26a7---96633715685.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/6l5mujbhvfuf6cvfehnfgknsb1/gifaxusumepijep.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/3670611346.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd34303b34---kubudibojatinuxiwo.pdfIn PDF document text
    • http://zenithmetals.com/files/tewanoxonilexubifilowaw.pdfIn PDF document text
    • http://vodnik48.ru/content/file/54965975414.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/52570020205.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/61f36e0d8e41a4226c6c66b7cd89e2f6/83686354485.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/litapowewamugiduwufiv.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/kasaja.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/tezosuvesofufopiboji.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc78a10032---nopero.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/murogus.pdfIn PDF document text
    • http://araonline.hu/uploads/file/14582750288.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/rdco1ah5qbdk9ga5ta4dkhdhfu/59961305941.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/ragun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=acoso+laboral+en+mexico+2017+pdfPDF 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_off0000bc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC92 11252 bytes
SHA-256: 594f08e742a4587aba0a5cf3bf8555ea54ba3f2062be5fd575bcb279ff736c1c
font_01_sfnt_off0000d6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D4 18752 bytes
SHA-256: 8e52dff374143ce18a32fc91c7cc88c2532190fd8f112bbbf7fa3eed39f95206
font_02_sfnt_off000106e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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