Malicious PDF — malware analysis report

Static analysis result for SHA-256 95b25119bb7d732c…

MALICIOUS

PDF

92.0 KB Created: 2021-06-17 22:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 71144233ca7b0f898f54e0e9cba101b5 SHA-1: a05104f7401549f2b6da300d66d9e60cc938e1d0 SHA-256: 95b25119bb7d732c85bb541c9d08dd41b9e1d3c58c820409738555031e527abc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to potentially harmful content. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, but the primary malicious activity appears to be the distribution of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999d119dc05---wedevo.pdf In PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/6f244522e5dc10b72c255b6ae02316ef/woxazalidogokaxokezoj.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/9b7b89098193869981e539f8989dbb9f/40617336297.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/u6k6509jfmugln0nrb72tg7cn0/84073017872.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca97e24e0af---bewozodexudoxasamedeg.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210527065223.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c144f7a2801---75217032512.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/90070777278.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/tidepijogozewu.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/26814897879.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904d9ac9729---ravoselirepodibufidoketip.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d662fc2bf3---wafevota.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/nimir.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8616633d35---sewizag.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/c23d385a2d13d28158dfacdbda688fd3/87813051897.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/e0fe3ec43b00a549be377279c160223e/navofapusasu.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/cc65386759e6919cd7246b50bd5732c6/kilibaxapesiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=cycle+de+born+haberPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46E 6120 bytes
SHA-256: 711a2ffb0c0a127d09fc16973ea34d6447e7786720cbfb9a2419b8e95838b927
font_01_sfnt_off0000f95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95E 4996 bytes
SHA-256: 5306a48b44d58a4a3dfc0b0761764cdc6db1687c5c0aec8be95043af69150645
font_02_sfnt_off00010a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A51 3828 bytes
SHA-256: c3e1475b256c34bca55ec2a3710fa70db298e919c5548ca9a217b61fc70ddc7d
font_03_sfnt_off000118ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CE 13904 bytes
SHA-256: 0e8f9f07c45bb5689af95f18f86a7a460045d6718fd7fc6fefffe09ff3264fde
font_04_sfnt_off0001449f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1449F 17852 bytes
SHA-256: e342d4fae8a517f4f740e909e676c5d5c91ec27ad8789f1411a766fd15fcd0d1

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