Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9284261c75f78f1…

MALICIOUS

PDF

85.8 KB Created: 2021-08-01 05:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f121d965fbf11444fa4f631601d42110 SHA-1: ae8f087bf9356ddf059a5586aee0c37a1bdcd4a3 SHA-256: e9284261c75f78f1c9a7ae41d3c73204237c1de6a8a1e3fec6e8afb05c3686b0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The 'SE_REMOTE_SUPPORT_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing remote access software. The numerous embedded URLs, many pointing to potentially compromised or disposable hosting, further support a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://huntic.ru/uplcv?utm_term=great+russian+short+stories+pdf PDF link annotation
    • http://hurtmar.pl/Upload/file/47207087440.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/lisux.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/popateraxovap.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee23a91911---40695864087.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/30356329930.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/6487090733.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/4d6a7e23117914299d1bcc3b9b85f9fe/75312687369.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/93647293280.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/4235294227.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/xuxugibajoxibuzuzemogu.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/gozozugeroxenonebeni.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607eabc721e29---13473647205.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d28b64204---mutiruleraparisavasiz.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/fa8a474255d1ad128c608cffad3c318d/sotanubibebojunem.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/gukoxutubum.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/vuvojugupirakelipatulude.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/98db1948497208e6fee279a63dba08fe/52591240131.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021071716210880554.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/terupenuko.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0bcd83a04b83256e4c0c77ff8924ad8/vowibogoditemi.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/008ebaefca893a1886fcc211d342a9d0/belepi.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/97017073266.pdfIn PDF document text
    • http://101doctor.com/uploads/ckfiles/files/60b482fd95b38.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_off0000ed03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 17240 bytes
SHA-256: ae756861c6ed9eabed6c930d56d61ccc295c6e21cc70464ce717c0ca863c2011
font_01_sfnt_off00011927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001313e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313E 10688 bytes
SHA-256: acb113a9c2e2ab5c8daa59c43d94bb81cd5811a7b4f4e41ccee1d423f81bcc7a

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