Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a1f03016f4d288…

MALICIOUS

PDF

105.9 KB Created: 2021-09-23 14:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7fac896801bb4b9a63944893c997880b SHA-1: d6c3a0ad8281414b0d07c7c2d5cc3b90ee4a857c SHA-256: 13a1f03016f4d28852fa10a7e6a3d390ad82f0541434248aea7968e8cbd7e48c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs that form a link farm, with many pointing to disposable hosting or compromised CMS uploads, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution document. The heuristic 'SE_QR_LURE' also suggests a potential QR code phishing attempt, though it is not directly observed in the extracted evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://fsf-vastroad.com/userfiles/file/23338214822.pdf In PDF document text
    • http://geoodwierty.pl/files/file/nodogodamobog.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/mulubuwipixes.pdfIn PDF document text
    • https://ienter.bg/files/46668480392.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-16/images/files/gunidigije.pdfIn PDF document text
    • http://farashimirooz.com/files/bafibazifikelufedoputafe.pdfIn PDF document text
    • http://someteme.com/archivos/_20210910094916.pdfIn PDF document text
    • https://dm288.com/slicice/file/89717677924.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/81450876625.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136b5bbbed79---89220919082.pdfIn PDF document text
    • https://telorgabus.com/contents/files/37181589749.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/fotelutugareki.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613771c8d2aa7---nuwekig.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109160600227557.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/i1lesc664okj3nqqiafuk6p0v4/dozowifukufevuzusez.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/jajatapisejeninufegoboje.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/82531503510.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2cacf2d5a---koroladelajawatadefub.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/giwisufetuxum.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/56113733605.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/tezajug.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/30519527819.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313c9f263b4---22372790143.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/53763707884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=top+notch+2+3rd+edition+pdfPDF 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_off00013354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13354 20964 bytes
SHA-256: e7be25ee45a2772fbdc97eb3fae45e5bd09657641de6628e1e410b4f4e5be6e3
font_01_sfnt_off000169cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000181e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181E3 10596 bytes
SHA-256: 8189f999bb37ec9221e7d8c73e126b5e85b7f7d1a8574d4aabc37bf4f1db9475

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