Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2edb8e61112563a…

MALICIOUS

PDF

79.5 KB Created: 2021-09-08 21:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 86e21ed6e0b56b1a998475cf499f2a2a SHA-1: 4490102e60b181e0e2e33325a15a5f128962d3dc SHA-256: c2edb8e61112563a2f055f2388048d4f1cdf92a6a4a2b89a98fe6bf081fec832
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of these links and the overall structure strongly suggest an attempt to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/cr0oq4pqd1h8j1ii8rjojuge4q/13916560498.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed26fb78b5---fijifiz.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/rifipoxivebogorabipav.pdfIn PDF document text
    • https://faceless.me/userfiles/files/ninex.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/38567968301.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/28392937459.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/92520240431.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613386f35698f---35449052156.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/remut.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/24072252535.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/64597791149.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325f63acf59---wifakarokimadar.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/runakaluwad.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/82674720543.pdfIn PDF document text
    • https://n-tlg.com/files/file/58166839450.pdfIn PDF document text
    • https://mangallagn.com/images/file/66868646183.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/zilamedosadixaremakok.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/84673649583.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/zovalojudizujunivegutan.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210901232110.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/gedalofobosusanivilisim.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613557d861c5c---kofobidajimupibuja.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/55062183155.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/zefuketezepixisuxobixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=adobe+pdf+converter+for+macPDF 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_off0000d1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C6 17832 bytes
SHA-256: 35f65d33d8b4be2acb38d74181769763f1c5ea2accc25620c7820e129c4bd63f
font_01_sfnt_off0001001c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001C 10664 bytes
SHA-256: 5ea246b9568b59b5eb804d57f3575137dbaa063cc8d381ae2103f0c3877049f3
font_02_sfnt_off00011859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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