Malicious PDF — malware analysis report

Static analysis result for SHA-256 858a7d80ca4e07b3…

MALICIOUS

PDF

103.2 KB Created: 2021-09-02 04:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 10ec62e2ddbe529f397af312ad3e3589 SHA-1: 28959489f66639ce2397e98c966978c03a75b2ce SHA-256: 858a7d80ca4e07b354fa02f084eff03c87fca063c832cf353eb4565c5561ef61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://drafthe.ru/uplcv?utm_term=to+let+it+be PDF link annotation
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/00f32e6b4f2ff6bfba157cfbacdf3f3c/karekopoki.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/bexek.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/91585363868.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/360524606.pdfIn PDF document text
    • http://toonesk.com/upload/88754599692.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/75214469332.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/6936580151.pdfIn PDF document text
    • https://kawanmto.net/contents//files/sibalidafafejerep.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/80739201677.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/773a85fc576653ade87cba7fb8ba5a53/gijakozefomofema.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/8a13d42a2e62882c87cc99dcf3d5e720/46990754373.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/68496830684.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/basakowebo.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160819c3730240---dimazujomezogex.pdfIn PDF document text
    • http://strefa-fitness.pl//fckeditor/editor/filemanager/connectors/phpplikifile/manoxozolube.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/fenqdg9hsgn990v173rq0rh3ec/raxigobona.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/4b4ffd8060f2a8360441e66fb652de32/19529101898.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749aef0c9f1---48941636686.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/wilupulojowixupeb.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/siwejenusanija.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd346b8d8e---felivilodujupelujitaxabe.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160f520b14f925---91287888806.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/samakoladigegenew.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_off00012f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F91 19336 bytes
SHA-256: f260a7778bb8a44959f75ecb710f0d5afb92e041ac6a74c85ad8b249185ea76d
font_01_sfnt_off0001624e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1624E 9668 bytes
SHA-256: f11ebc0592f428bc88108288452b24619209688784ce7be40ad91de78cb7ec99
font_02_sfnt_off0001776c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1776C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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