Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f5dd390e5fec54…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 17:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eeaff22bc1bfc519aa59c07ca3c5b546 SHA-1: 2832fdcf81e1554b60378bd77698a5be12f7fa30 SHA-256: 18f5dd390e5fec54e66da76a1316c0695ce653caa2b0f6176bff4d5b693a7b95
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://coretry.ru/uplcv?utm_term=the+old+guard+gomovies PDF link annotation
    • https://fwstc.in/userfiles/file/73712377137.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210910090647.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/kitulojutomerefexe.pdfIn PDF document text
    • http://chpcentre.com/files/file/zafuwabafa.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/vejotorikejumopa.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/lajurasiwajad.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-4/20210904083023440920.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/95645144008.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/34771377838.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/wosezoxenatokaxogirufute.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/15959658537.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/b02627iod5nrr8nc1h6n4cmq6t/revibi.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2e637a329---15791173260.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/98003456892.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/tozovixezewizafawofuvov.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/12779885105.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/81219510771.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/74300961784.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/rovutonetasigalijowuw.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210902_FD2E28B165D780AF.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/1449579796.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/c84d26b860ae0460b989d34d8ce51c53/26013937239.pdfIn PDF document text
    • https://pactforfamilies.org/ckfinder/userfiles/files/wulagimunabiriwusenudeg.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/zixoronabupen.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_off0000d0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90E 10624 bytes
SHA-256: ac75dbc899b4f4fa6ffd3a3871e9866317508891081df0e0f68cd1e60431f9dd
font_02_sfnt_off00010125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10125 17984 bytes
SHA-256: af30d5913d8f27debca218024bac90b48a5bbdc836a3e21b3369d7a00e97bd95

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