Malicious PDF — malware analysis report

Static analysis result for SHA-256 f10ca58561e6fb2d…

MALICIOUS

PDF

78.2 KB Created: 2021-09-08 04:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c4ce3b0bcbe47665d9320fccb38eccf1 SHA-1: 9c0fe68608268fb36094c1411e5ac12a62d09222 SHA-256: f10ca58561e6fb2d85c847268ab01f54bcab8de3166fc74e7b274f74ab636a93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://thaoduocvn.com/userfiles/image/file/93117285299.pdf In PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/42252276575.pdfIn PDF document text
    • http://kasargod.net/uploads/file/2983158729.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/11ec7b35050a6d3079302e72fe85f0bf/8080856809.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad215ab6f50---1220494487.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/1013415628.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/womanadugeralos.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/1563c55220bc133cdff34f9c0c47adee/pirakizegedogoseresux.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/dumovataxu.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/welek.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/n5qdmqnfgirb3gd69m9rib5kq4/67433217184.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/zekakafunujelodalijana.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98db84e42e---17799598374.pdfIn PDF document text
    • https://lysgaards.com/ckfinder/userfiles/files/wogosa.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/22840d1b1cbaa2ffdd1cacd06350349f/dulavix.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/76a942da8fd204723757a621af1009d3/53249192352.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210707/210707232801445370bgma44o77p47.pdfIn PDF document text
    • https://yasacompany.com/upload/files/29259227534.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a37011cb058---76501966639.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/gaxapegadagigi.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a6db44fad---vozatamixokelajejupuk.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/mitapemos.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/zelojupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=republica+romana+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89A 18704 bytes
SHA-256: e1ec118ee17d28dd8bab44d99af1d8564af02b6f1eb00d6785be25cbaf48e4ef
font_01_sfnt_off0000f978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001118f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118F 10800 bytes
SHA-256: cb730847ca276e2b177a0a0a7ff8fe5569ae27ffc019328e444a3f19779c9136