Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd6e55ae9df0156…

MALICIOUS

PDF

72.1 KB Created: 2021-09-28 03:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 040bc238cc7c76a33fce0828f97b554c SHA-1: 842effc595c822bb62eb39878b68794e7a429da6 SHA-256: 9dd6e55ae9df01563e61e21f73578eb5d6c7d8ccdf81b5966fdfbb0410d305ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's used as a lure for phishing or to download further payloads.

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://crysiq.ru/uplcv?utm_term=online+perfect+piano PDF link annotation
    • http://bike-aholic.com/UserFiles/file/jugolilaxiwoxuxadezedu.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/ritugerugazukut.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/lorazimafupufezabo.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/zumetizila.pdfIn PDF document text
    • https://successalpha.team/upload/files/ginugagi.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210908222628.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/woxefemaniwi.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/88679548991.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/88145314912.pdfIn PDF document text
    • http://scsytech.com/upload/files/naxonovubajuvorolesevonev.pdfIn PDF document text
    • https://taperagi.com/contents/files/11335282599.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/86768163589.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/b11ecc1be206f415a55b2b15d1e553f7/13115253404.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161467b9b3d151---60954375634.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614e6d6d64e87---dizafiminanunobas.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/rakipoputopubo.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/mejaligavaxemizuso.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/75143226031.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/lazupopenufoguforubi.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/mujexakaxodudawepi.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d80980770---gutugosa.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/54920100762.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/67670032856.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_off0000b4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A7 10332 bytes
SHA-256: c72cf6427347375bb010ca06f73d44e9f6fe617f8b6e7ed53f4c6d778b85f13c
font_01_sfnt_off0000cc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC10 18096 bytes
SHA-256: 4f38e6a6deb874b760957cc5644c22aa322aec78643f7ced5a22ba62aeafa8dc
font_02_sfnt_off0000fb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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