Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57fdd30e3bd2ad6…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 07:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f27fdff8b517ece02a132782714a6d7 SHA-1: 4b0c374befc4eceeace553fe775403287af9afe8 SHA-256: e57fdd30e3bd2ad6633778d18b73a4fc06c3d040c6d5640a02aaf8a3119994be
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Numerous URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=the+ants+underground+kingdom+game PDF link annotation
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/wivujogudaneb.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/voniv.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/mijijezugefukadedarejix.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/13106014068.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/0nk7a3n8udpbk7624mhjvnqpb5/34689790129.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e332d068c8---zewidaliwufaw.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/0ce424f110358d1b05fbfbb17ea2351a/lukewanoge.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/542e3aa24d5789df60ee6110f8220c6f/74021632887.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/sawapodukikeligigojin.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/kowemixupu.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/29556964602.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161458d7779a20---lolukafopufolaxosepefo.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202192393772061.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/96971130468.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/maroxeguwiredutelafesutag.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/94420461788.pdfIn PDF document text
    • http://huiking.cn/uploads/file/221308474908.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/35295788081.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/74480203516.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/87146222075.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/64281459592.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/fupigapuwugefaruxeduj.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/delesogip.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/xonujiwubowefun.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_off0000b02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02B 15044 bytes
SHA-256: 2ad279d1664ea7d52a27d408d78dae69dbfb220f2c0d3e11ba4eeefd310bb0af
font_01_sfnt_off0000d5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E3 10804 bytes
SHA-256: e16b21523c5c97357c85984d2716aa222b9497a3fd3901a80ac325687ec7adc8
font_02_sfnt_off0000ee64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1