Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b52cad25d3e8da…

MALICIOUS

PDF

104.4 KB Created: 2021-07-06 01:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8dd2b22bb771d2f0a39ee7965ec2ec19 SHA-1: aa5d8c5c955f0ccbd6f1757cbf9aee642d891631 SHA-256: 08b52cad25d3e8da71211b0de865b227fc4408bfca71af5051b9f12a29674afc
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on compromised websites. This suggests a multi-stage attack, potentially leading to phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ailani.org/wp-content/plugins/super-forms/uploads/php/files/4bea9f67c86655b607a581642724ef80/27893289116.pdf In PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/85d9bae0a4a96ecbf6588f0906aafe1c/76679801189.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/nikaxiwi.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080768944d5f---gevujivet.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/kizovojoginomojuzatewerej.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/fa7e76b8cf0a6f8f600de2939de8456d/47260830003.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/d6e3005c3f47905b7015e36d52fb57c4/wexosubojadajoger.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/89645864228.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18bc3cec33---pibesazelokusofuduvexasi.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efed0d956d---maronavakeva.pdfIn PDF document text
    • http://vasamo.org/pds/userfiles/files/90313931625.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2f754665efb389d4344b2c9e21d3b6d3/35611267890.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/tumonutewaxafuse.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/26282661137.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/57007432493.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160824d23e02f1---99882019039.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1ad97e359---novalowiwexugudivab.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/zizojukekoxurisosugupisow.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d67c9605c---15580708185.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1808f53d---28039834145.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/b4fde82b6a48477f9c359465a507dae4/megutazuv.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/woladiz.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8b3665be2---zegoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=create+array+with+elements+javaPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000135bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BD 17580 bytes
SHA-256: 5625718fae8e0d1731d232bd0e2b61ed92ce182202a571bb3be6561eb200ae1c
font_01_sfnt_off000163fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163FD 10680 bytes
SHA-256: 66a44fa0c08110bb11138252c83a26312dda6f2c5cd39484fc5b1f8b5a525668
font_02_sfnt_off00017c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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