Malicious PDF — malware analysis report

Static analysis result for SHA-256 d92a6e26960a6914…

MALICIOUS

PDF

79.8 KB Created: 2021-09-13 05:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2b20f57a0ed8c0e5f5fc7d19acc5f2a8 SHA-1: 24ae3de865c0f3a10d1686d408100d93b60f4279 SHA-256: d92a6e26960a6914dd52600d0fe4c1593c7297a2aa7ac7f7c697bde12511d6b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious or phishing sites. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malicious content delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/vazivevegu.pdf In PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ddb431e71b98c7ef1df56666b792d384/nelodamif.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/mapuraxojilo.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/11657773837.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/86825323104.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/245b4a858c670e77afd0d6d4c5ec0cbd/divopilu.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161393fb45c5de---ferusibekixatasot.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/68358199132.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/witamofijutufukugesad.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/zikuxik.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/35904085728.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/junilox.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/5121776970.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///rasasitevodojenefa.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf26eb0ef1---kobaloxixokevuxafuzo.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/96923259730.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/kazeta.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/vurazoju.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/99109359578.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210901_144BB52D3D9A8C7F.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/nopineb.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/vozadowesepatogerawuzotak.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/82189236599.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/95980503597.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/zalasavoxaxowutovuf.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/18105164466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=custom+dial+pad+androidPDF 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_off0000d0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 18648 bytes
SHA-256: dca4e60fcda41e6a1c39726bea7348f27ab5977370bb758496f88ee9d6eb3c6f
font_02_sfnt_off000119bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BB 10552 bytes
SHA-256: 3fa27f64cf7f37dcbd8c4df47a7056a59ce4db76721ccd8e469f0794bea6db38

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