Malicious PDF — malware analysis report

Static analysis result for SHA-256 436451f20a96b0bf…

MALICIOUS

PDF

90.7 KB Created: 2021-07-31 23:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3e173e2873766310540c84424a205d93 SHA-1: 9f475b650de7262ff55d0e459a7c9af289f791f7 SHA-256: 436451f20a96b0bff65617757953e8d395ec1895827c028d8e962252622962c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to websites hosted on compromised Content Management Systems (CMS) or utilize disposable hosting, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medtravel.lv/images/hand_uploaded/files/62546894881.pdf In PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/a4646a7b00cf190800f029604bb97fbd/356933578.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/84201320151.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-20/20210620135811575842.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/gatafasefofuludofo.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddd7651693---31031883881.pdfIn PDF document text
    • http://www.bandungmesin.com/file/lotazosu.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a1d92f5ef---25003692080.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/vuriwafurowafimemefarike.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16074493b2ad12---sexoni.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/raxaravopudajixama.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/tuwotozakunokisoxuze.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e23154a024---64275934981.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/f38081fbcecbee2b189bdfa162e922fc/kanotetepejebepe.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/vokegedop.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/mujowupivapames.pdfIn PDF document text
    • https://zahnersatz.pl/userfiles/files/gesuxujavaged.pdfIn PDF document text
    • http://geoman.cz/data/file/5651918434.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/bipotaxodozaluri.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a6db602d4---xogofitonuwuri.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/19f661216eebfd7b4a3f5a844e9a6f5c/vikavubitatunimuzoxagegov.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b597ee6f182---18408747898.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/viwifuropodub.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d5e354cd1---kafutolikegokusezifuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=sermones+evangelisticos+para+predicar+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_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C60 20644 bytes
SHA-256: b32b4157532547f88b02aff3a299290139e30cf33ed2853b5ff380b157401e75
font_02_sfnt_off00014195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14195 11104 bytes
SHA-256: 95356d018edecb7266f3dea3d39b0ca642a4945f7a73dcd11c9fb2cc4a80fcb6