Malicious PDF — malware analysis report

Static analysis result for SHA-256 720d8f65f21a7199…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 07:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01a4064a1f2de29044f008eb1b9eedfe SHA-1: cb0000ae8c4b52500457c6b52c7c2803cbecd7c0 SHA-256: 720d8f65f21a71994c3d6f489f06095c09bb4aaa7716bde09aeb44d2a309f2a9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that function as a link farm, with many pointing to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://medvor.ru/uplcv?utm_term=40+super+hot+slot PDF link annotation
    • http://pattarasawat.com/ckfinder/userfiles/files/89006534399.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/36968982301.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/xozelefirun.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/ledafiwa.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/kaxurelukabebalo.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/xoril.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///37769410573.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309465ddaaa---pubotelotazi.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/49124207695.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161391896d3825---9954160481.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613948b70eba8---jipikukasaxokumobigef.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391f0875d31---sodoretonuxeduvilumusaz.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/nevoxetu.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/24991314809.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/50371203713.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/sadifizedukuselenuf.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/36910432824.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/19868567395.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/27414253225.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133469123b98---fewemisoped.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eabe239443---joxede.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/72519772107.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/88460540932.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/54765493295.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/difesujolegovexopafi.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161325c62030d9---7325365046.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_off0000da6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27E 17484 bytes
SHA-256: d42c11e51b4813314cb26a12f1e9311c9ec0dd0e1a8e6e6feee674979855d2ea
font_02_sfnt_off00011fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC5 10192 bytes
SHA-256: df13bba097c3d1b19872a816df6c6614c41e145e7dc46b6d0dcfa73cb11c9657

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