Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe558e71e61d809…

MALICIOUS

PDF

70.4 KB Created: 2021-09-17 04:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b2e06b4038cfd4ee942678ffb4228566 SHA-1: bc0800e22a8a32323fbc1223b90c1c4736e24b61 SHA-256: dfe558e71e61d80983ade28d644ff6644e2d940843fe83caa3ba64b5dab2f0d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=aircrack+ng+android PDF link annotation
    • https://spacio.hk/attachment/file/75020652065.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/vukogisepikevuvaf.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf6be61dea---81366968576.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-11/20210911021239620642.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/2972213500.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/39213720203.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/74603104424.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/jizutevizejizixopogati.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/vuderepedusalebonatarer.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/79681010725.pdfIn PDF document text
    • https://wita.lt/images/files/sisekabaretafoxufopak.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/77oiacpi9g493n1desveej0v0s/8307740471.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/97879567987.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/kowuzavavuwibu.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/99468931380.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/94850714959.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82732271483.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f821c7253---domakogezon.pdfIn PDF document text
    • http://ndfeef.com/radiant/mechimobiles/userfiles/files/4189860092.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/selotej.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/tawev.pdfIn PDF document text
    • http://samtekelektrik.com/files/jawatudug.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/tejijum.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_off0000b038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB038 10176 bytes
SHA-256: 2c1fa77fa6ee1ea4efd4cc3f84e71e47a3b1b471e11c4ac6e550a5b42c5c8564
font_01_sfnt_off0000c6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DC 17852 bytes
SHA-256: 8faf88759c13bb32fc807f18ab088863d29882e0cc4373e3f8da725399fc4116
font_02_sfnt_off0000f47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1