Malicious PDF — malware analysis report

Static analysis result for SHA-256 308be561565c51db…

MALICIOUS

PDF

76.3 KB Created: 2021-09-05 17:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 362d06dd06a01379b15f4aec8051180d SHA-1: 248b484c28a539b316fd52282eee371400958c6a SHA-256: 308be561565c51db1e3d6be7b0fd94ccb4b704a84efc25c746fb786e15a1537b
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads. The PDF's structure and heuristic firings suggest it is designed to lead users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://accesoriosalmayor.com/images/userfiles/file/54117328947.pdf In PDF document text
    • https://wipaphun.com/UserFiles/File/dolupuzi.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd3472996e---54020473662.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/kre6c2u0tmoa8jur4a11mmpnl3/32381423567.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5c3358015ba530c454c6a63389d46ff3/vurusirusifilujo.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861618e5c84---mewirogorafotif.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210829082142.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6cb8ba553---6696089617.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/9e528b2468fcf65d4d0170837d5e29a0/19043319245.pdfIn PDF document text
    • http://tyextractor.com/d/files/zitovefi.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/dl2vsffcrkl50d8f7h8p4qudq2/54611612849.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e06d5f77b---82440221454.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/83853135206.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/c7770f565def3e518e2732caa619dea2/lutowemosugovubu.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/0b88f6f4a6769049d9bb6eeb3b2d5f16/jibijupofawifomov.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/1241278588.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/3i7vbkn00v0q1k4jpcm9gjvhi7/midavuwa.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610ad1c63a9ce---65252894950.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/40337961599.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/rukidibejaweporumod.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/43797425633.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de352ea4d6---xiwutotedova.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/5a95bf63a9da52ebc1a43e698b432a1e/nibopidakexefe.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/xopazexirixezuf.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/70598143241.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210728_A71CAA15878A7F69.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=wells+score+for+pulmonary+embolism+pdfPDF 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_off0000c62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62D 16968 bytes
SHA-256: 9b976ff44be43e4f3bbba33b67382f707f45129431e48ed5284b922f7c656d1e
font_01_sfnt_off0000f1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D5 11028 bytes
SHA-256: 0665a8ef536371875dd21a9e2cf42274aaa579e9c19705e74f2641da06cfb3a1
font_02_sfnt_off00010b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.