Malicious PDF — malware analysis report

Static analysis result for SHA-256 7413798dbc7fa93f…

MALICIOUS

PDF

79.3 KB Created: 2021-09-21 07:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0e24d77284fd9ce0a70dfd54d914613e SHA-1: bc0eafbe441059eac70211ea9442f9deb74c4203 SHA-256: 7413798dbc7fa93f1c737fe0480cddceda4211718da547dd7fcc14528c29018d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=encyclopedia+of+magical+herbs+free+pdf PDF link annotation
    • http://sciattella.net/images/file/93311463977.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/xivopulunutojapade.pdfIn PDF document text
    • http://muszempilla.com/files/file/21593309048.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/73656737355.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/41776381194.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/488aebba02d7253822ec2628e608ddab/vuwida.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/50526960964.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/pomezu.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ce51ltq213of20ih3sqcl8d3bm/wikan.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/47283846626.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/46721885746.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/23613368943.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/84043692072.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/93101156878.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/66ic33fqb5rkl5hkue55j2jkt1/20882711001.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b53660af9b---66259577471.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/7691405076131aa98cda19.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/1413775871.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/86676379984.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/35153814209.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/17044039722.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_off0000cdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C9 18576 bytes
SHA-256: 3eee77cf1a937abae5a4cf2fc30d395ef3df58c1854241fa2f2ac05f2b9f1068
font_02_sfnt_off00011614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11614 11208 bytes
SHA-256: 50abfd8890947cc01d72db7c0316a2f40c5b20425165fcc02145736addac414c