Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c51f1d64ea041a…

MALICIOUS

PDF

99.5 KB Created: 2021-08-19 16:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 03d8b3f0b687ef714b24e8dbe70f0de2 SHA-1: a9a5545035da93969d7961b04184d7b617f3f0f1 SHA-256: 25c51f1d64ea041a8f93b251fda55a21d6477b42542f768c8a7223ce2f1aad7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS upload storage or appear to be disposable. The presence of these links suggests the document is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cuatudongsaigon.net/uploads/files/juminariwevofaxujojarewet.pdf In PDF document text
    • http://imi.vc/upload/files/monibonezigorajabazad.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/97912079624.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/24123883939.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/69d47c75905ca0c2f69de4f4798a424e/xatidaror.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/18415609547.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/26289643938.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/24941038225.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/2fs64t1dbevccinalglh7ur6h3/28861952559.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/gaxebar.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/9tmgchfhkf2vdggcnk3l11kfgh/98092345347.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/wabukuwaxoxisibejanupon.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/76381762620.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/rowisojupaliru.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd0932e322---28594571976.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/dopamefovaxutozi.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/39e569b4bb92785310e72f3fdf3558ae/nitagijojawirodugupevipo.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/7732011956.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/heofcbhgriosd893lp0tabhenq/41953814821.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c921c935d---sutogepifimotoker.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c090f861de---vifemufefawesanududume.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/xidobanigavaradorukomibu.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/53334713929.pdfIn PDF document text
    • http://ogbchurch.com/clients/880797/File/raxanozaligezixit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+bind+traxxas+tqiPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C1 22620 bytes
SHA-256: a4bbc5bc9b23c39835003674f708147ecdc94d866faae31792c02d8b92191b03
font_01_sfnt_off00011d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D40 10528 bytes
SHA-256: ecf7ab9f557a13ffef6befa1810fe01f8a7dfce2c3970ec5cfb2438304e8b369
font_02_sfnt_off00013523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13523 15812 bytes
SHA-256: aa52d5d34510e7ad4cafa06da1c9af2a469e3fbd0439fde7c9774b5095233220
font_03_sfnt_off00016542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16542 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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