Malicious PDF — malware analysis report

Static analysis result for SHA-256 b34570645c5918cc…

MALICIOUS

PDF

83.6 KB Created: 2021-10-12 02:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2df4b6ae806e3860b0d9e45ddea0927b SHA-1: b57b502228bc244b6f6f7173a81d9ab70f3ba1cf SHA-256: b34570645c5918cc973371653fb468691d9e5e5a6a8c260473cc3b465f5fc8c3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves luring users to external sites via malicious links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/9a0bbd36af67b933c77e7c04ff39dcd6/8598382502.pdf In PDF document text
    • https://lacaune.hu/userfiles/file/togakaboku.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/jatezabisaguwuvewoberelaw.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/40080393407.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210926031621.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/zogiwamosakebes.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210902080036.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/88474456021.pdfIn PDF document text
    • https://ourguarantees.com/userfiles/file/36580147491.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/99414164905.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/bexaboj.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/molufevikil.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/matiripejomudidete.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16155a89900c6e---98641597969.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/ninubegaxazufupivopawumok.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/84547018958.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/32613017580.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/jugize.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/21689631279.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/80477483524.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/zeduzufavenulux.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/57743499850.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/84086783468.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614f53b9432d2---39554015093.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/vopeg.pdfIn PDF document text
    • https://afayl.com/userfiles/file/dafomojonixoruwededelubet.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/896FEnmJZlk/uplcv?utm_term=old+mappila+songPDF 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_off0000dc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC26 20660 bytes
SHA-256: a56aea48dd7375087e8bbfab6c220f43fdd79f258c60599cfbf27af92b9d79e1
font_01_sfnt_off00011176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11176 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001298d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298D 10428 bytes
SHA-256: 029ee570c7410a537a02d2de58e0cf93ca01dd0344da7673232969bb1413be27