Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12c32dda4bd93e2…

MALICIOUS

PDF

86.2 KB Created: 2021-09-02 04:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1920aac9cc87636967e491b1fefbb4e0 SHA-1: 20e30820d74fb03792090e3055366a9e39839368 SHA-256: a12c32dda4bd93e28d95414441c52d08f50615c5733011382f95f22a73f14290
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised CMS upload directories and disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drakbera.com/ckeditor/ckfinder/userfiles/files/keviponikizukisi.pdf In PDF document text
    • http://redactron.com/userfiles/file/munetivipumazirasatubuz.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/xubigaweme.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1626627761.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/rupojemer.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/425bfd4799da9b573b1766a95cf60b4c/81780847387.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/31d87f1aa076aab84ae2174a8cd6c315/timojoboj.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/jabagigaxafowu.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/95966233559.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/6984422634.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/noniziwimo.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084f928ed16e---mojilurejesiba.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f763db663---kalenidiges.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd47def09d---58606499323.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a985387a3e2---mujajorirerabatitogodes.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/97739312718.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928c15375d3---24294911824.pdfIn PDF document text
    • http://www.moyekolodin.com/files/todudidurusuxo.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/98821514507.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160723070b70cb---zonuxosoxo.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/ligibomogidugepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=calvert+principles+for+responsible+investmentPDF 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_off0000e930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE930 10880 bytes
SHA-256: b7bebd89117a97b246d5ffcab814b5bf462106a3bb70f974cd3cfc16ba45b980
font_01_sfnt_off0001021e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021E 18772 bytes
SHA-256: 208f77cb8fcf52e027351fc8c73ec15d23ae02efabe4670e37bb6e5fcc4f7f1c
font_02_sfnt_off0001331f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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