Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f21260765a420e9…

MALICIOUS

PDF

84.5 KB Created: 2021-08-29 04:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0c9e4b74e49c4ac84ef82fa23fdc090b SHA-1: b233a8a5f0b79567a318cfc998fee1d460bb9644 SHA-256: 6f21260765a420e997f01c93f21a9e16d46e907d4c5d7f6a50e8ab76c0ce0754
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads, suggesting it's used to distribute further malicious content or phish users. The embedded URLs are the primary indicators of compromise, leading to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/bb70be5bcf89d7a03edc44f6a2cc2e0d/64734548876.pdf In PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210801052546.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7d9028d1---21764455541.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/wofem.pdfIn PDF document text
    • https://adikketiga.com/contents//files/83782214131.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094a92b012f5---sidew.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0ffdadee6---35231734086.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/rarulanebiduneroxanaduba.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/59062300891.pdfIn PDF document text
    • http://dgjst.com/upfile/file/31639727202.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/61843827437.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/75667122273.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/27088a0b2f4dc9cd7120e307e9f8b754/vogeviza.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/33595456807.pdfIn PDF document text
    • http://fedime.org/imagenes/midoxinumo.pdfIn PDF document text
    • http://nhs71.com/clients/d/d9/d9c6bfbc4bbdd207836d30c01fe5869c/File/nitogukazukirenemoso.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/76420144247.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/11ni6pg4ig6kb07oieb9g9pv4v/dawodojibazumek.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/16692920073.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/wasalurasafijogo.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/pemifamiluruvidulela.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/50294459248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=cat+made+out+of+keyboard+symbols+copy+and+pastePDF 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_off0000d971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD971 11168 bytes
SHA-256: c4f5d6b1fcabbe5d4fa8dff054e90bcdacc2af3ff51fd56252c37f6ed0b73f36
font_01_sfnt_off0000f369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF369 20980 bytes
SHA-256: 84b1af261a4675cd03bd51ca0698cce5bbffc0d3550b7e10bc36effcbce8e568
font_02_sfnt_off00012b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1