Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a38975c3f381127…

MALICIOUS

PDF

85.8 KB Created: 2021-09-17 13:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5a32f31459b8a6a729e53d86d730af9c SHA-1: f3125d62563e27fa5e70500c3c06748adf65a9ca SHA-256: 6a38975c3f3811276ba7f7965239177b486bd9f29938835fcd9d6bdb658ba269
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 uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the primary attack pattern involves luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/ginevamen.pdf In PDF document text
    • http://ok-poland.com/userfiles/file/93962474046.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/79844629269.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/napawitofepoku.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/92728068971.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161376ae4b08f4---voloxozes.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/gulugifilake.pdfIn PDF document text
    • http://garderoba.sk/images/_file/23552197413.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/30269593545.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/96538865412.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/b8d4ff80703edba04455f65097910760/6117325700.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210910050755.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/33599626817.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/85632229967.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/gijuluwigimarotetoremun.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/wozofijarulakitevu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/firifivebolut.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/rowefazepejatalewazeg.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/67612796736.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210906115151.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/22212432202.pdfIn PDF document text
    • http://sb-78.ru/files/file/jeleripevowunutesasovofux.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/81651607104.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecdd2bcec3---mudixed.pdfIn PDF document text
    • http://freestyler.cz/img/file/taserapalokamitamipi.pdfIn PDF document text
    • http://videlec.be/ressource/file/93637555258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=android+gem+gamesPDF 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_off0000ee90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE90 10428 bytes
SHA-256: 42c50676ef776127220ff760392b4ec01cec51dd2069bbb5987a77b09a194514
font_01_sfnt_off000105f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E04 17024 bytes
SHA-256: ea9be34893ceb9284444a45859a3a0669f466fff6785328d7ef806d9d558b2af