Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35ebffbcfa667f3…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 12:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f6caae019fde20656341a5500880973c SHA-1: 7b9ffb81eaa1d6fdca635e65df456ce370e252ba SHA-256: f35ebffbcfa667f3cf2f8927525fafe7aefb599667201d35ad0a1abf6d811d69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to compromised WordPress upload directories and using UTM parameters, suggests a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver secondary payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=my+heart+will+go+on+easy+piano+sheet+music+pdf PDF link annotation
    • https://hondaotohaiphong.vn/upload/files/jubotulukama.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094020a5b5b6---rawiv.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e41d7a6cb2f---57192604814.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/wazaka.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7db1b53ee3---fezufu.pdfIn PDF document text
    • http://vestol.bg/files/file/82558121249.pdfIn PDF document text
    • http://chhsclassof64.com/clients/b/b2/b21d6454c74b38f294a67049e63db9d7/File/natoworivixa.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/sujifozupikonowe.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/godigonopoliwesawuvenomut.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16085230a270a1---zaxajasona.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/82064117739.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/17632941624.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/8bc007af60c00f46983411f43b87261c/jatapasikatofogufavut.pdfIn PDF document text
    • http://sb-78.ru/files/file/76292269084.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/17777801722.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/minuwatafusalexisideb.pdfIn PDF document text
    • https://mashura.co/userfiles/files/kuzixunajigobabebeworej.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608525f78f2df---18417673910.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/59039388637.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/bixaminet.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/mapev.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/mezezutogofatatatita.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bdab300debf---wazizekefokaviduv.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_off0000dd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1E 18900 bytes
SHA-256: 641c6b3dd9109d7fe1b57abe8e23796bd08b4cd01e6e7c5b5a3195f7ea8e3bd1
font_01_sfnt_off00010ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA5 11360 bytes
SHA-256: 00daf8c8a79e2c86e1614f8fea865ccf2bed56242984ba0b9c12261f6e5fd516
font_02_sfnt_off00012718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12718 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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