Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c011ec313ffb233…

MALICIOUS

PDF

94.5 KB Created: 2021-09-05 14:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4ea0f4b476b62b4279279ac080fd7184 SHA-1: 328b2c134c438231943260aa2ae1ac99124a6e36 SHA-256: 6c011ec313ffb233f4400dbf5ad150f6ab781b83626cf2f3551822e783a5fe75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://allytemp.ru/uplcv?utm_term=comparison+of+adjectives+grammar+pdf PDF link annotation
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160770e6dc1ea0---bupulutolitakebepivu.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/98733094192.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/qqcoaogrp4ii0ohr5kfob8lih3/40706278982.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/xovuraxojubozagagotudib.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4fbb22273---16841560342.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/20plr9qqbut1dlj2pi0tubei80/83067879353.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/majikajokebiwesimum.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/juvole.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb6643584a7---nerejigovavebusux.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/36698074585.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/d1eb95e63d76483f8225e508a86134a6/lulesojelafize.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/63609389949.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc2e459e582---18317163685.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9e5771591---55409254437.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/aa769d1c0b457b3655ed7a93e56e5baa/84580231479.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612775e966e16---jijakokimesipoveziwidowa.pdfIn PDF document text
    • https://irrisyst.eu/files/file/feguxatubuxaru.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/vuwubujek.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/tazodalunovupozazisanifuk.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f16fd683f8---nubalomifegozegalun.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/rodatumijapeketoveru.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/76615818429.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/nesinuv.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/91444403506.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_off0001018d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001199f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199F 21768 bytes
SHA-256: 4bde1a385ae1589040b8bded8780b1e243fd0a26f228a97b2b61eaca334dbcfc
font_02_sfnt_off00015244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15244 11144 bytes
SHA-256: 8282b465e5fa9d62936cecc0d5ffa2a5285b0cece08a6956148927abaed495ca