Malicious PDF — malware analysis report

Static analysis result for SHA-256 6886179f57a9ac0b…

MALICIOUS

PDF

93.3 KB Created: 2021-09-13 13:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 02f0f3176a8677cd797d88292cbe3e07 SHA-1: cc642d34e222a0350a24f1a4c3fcc78c0585b362 SHA-256: 6886179f57a9ac0b7143b2cd165ab52a107dde3662cac20bb6bed93080ec67c5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be disposable or compromised hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this document is designed to host links for malicious purposes, such as phishing or distributing further malware. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://pixomot.ru/uplcv?utm_term=positive+word+that+start+with+k PDF link annotation
    • https://semineebrasov.ro/printuri-fi/files/92010825219.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/61517917207.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/pezoson.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/xefogumaze.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/nogikekovejawesixo.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20219295025304.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/refonizoxidegiw.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210905134745009502go6vraetoxya.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e40ef9f6a7---fefigobo.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/41217515386.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/kanigo.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/tekozoxow.pdfIn PDF document text
    • http://archive-2014.humandoc.pl/attachments/file/82614403228.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/54346916811.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/zabovusajixalinoxifudobo.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/8444228372.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/migagokiwafalarukukaj.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/161355449ab918---78645932811.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/17014326996.pdfIn PDF document text
    • http://dison.cn/filespath/files/20210909045334.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/fuwinowagotiz.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9utg8dirrrp0687ibf5vqpunf2/11823931201.pdfIn PDF document text
    • 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_off000107f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F1 10440 bytes
SHA-256: 6eba7a26a7081d44594fc8d89602abd31647aa85a6a1ce92087923048b2961a0
font_01_sfnt_off00011fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDD 18532 bytes
SHA-256: 247bc7e019a8da924f0db30d45f6771716ad5aafad8c206a03f1c3328118341b
font_02_sfnt_off00014f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1