Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d2f9bbe1821e90a…

MALICIOUS

PDF

84.0 KB Created: 2021-06-19 22:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9499761637c4b6fb1c9215a248c67d87 SHA-1: e6761b9a7ee7e951ea6ca403c4e9727c7488ddc8 SHA-256: 7d2f9bbe1821e90aa0d878c53b2a40387f9123be8fd0840b1156474c599f6054
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics indicate an attempt to exploit users through deceptive content, likely leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ayurvedaemart.com/uploads/file/jifozajepobite.pdf In PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/o1ulq9pgllucafnk33rhdgf3ng/89434117970.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/19628695760.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/0m747e44tac9sugpm4ss81mvei/nagatinirufatulagilowimi.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/wevomaxexam.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49eebf347c---18851042869.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/fbb08c70c9e8ea9e301012e26da0030f/gipepugemedarakuv.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/67e4ffa3a1fc904449571186bf27f590/28761766032.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/269160cd14799830427dc5d8bc0569d0/29409059479.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210616183638_2096939263.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074ac5723039---zelije.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/gebavosatukejovu.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/kekujujobesevoto.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/d98e3cacf71f0306cff9388dc8aae216/58881103628.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/1e325e06611e8c8baad15d7154858e06/fufarefadojitowi.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=basic+tamil+sentencesPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f44c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF44C 19016 bytes
SHA-256: 1d3bf85845ed22d7d50b31cdeb79b24e106e51ab3a5a8c280efae3798dc669e7
font_00_sfnt_off0000e3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B8 4896 bytes
SHA-256: 38957c0b1b572b98c9a8737a72f9a086a69701c54a528cf311de530bf8283401
font_02_sfnt_off00011d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D47 10756 bytes
SHA-256: 6c09eca6e1ce0dd0a54a8cc3bf0f08146dc6d41db1f2f6a99e6743f73ec59ec4