Malicious PDF — malware analysis report

Static analysis result for SHA-256 a809cbfcf356a3b9…

MALICIOUS

PDF

113.5 KB Created: 2021-06-30 23:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1a02a16eb99605542ebe2a02aeb47ae5 SHA-1: 5b28af21896efd4c91175f24baee6e28f63dc544 SHA-256: a809cbfcf356a3b95fd9682ef748fab21e44a1cfe993493ad1e28d47f66951f6
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it acts as a link farm to redirect users to malicious content. The presence of external URIs and compromised CMS upload links further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://infrive.ru/uplcv?utm_term=public+relations+strategy PDF link annotation
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a69d37a0102---12158358616.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a858b0a6fdc---wadubotasi.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e90625958---66443497225.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3fe7e4705---89260477568.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608628bbc87a6---83566513051.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab3d1dba48---64511083276.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1c0e966a9---najazovavebadexiduza.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/f78de12917c222d11a27054d0d1be9ad/13909874673.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a183b4a9eae---84755081866.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/morejus.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/19806259322.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160a2aa261d073---2050437044.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/dukelubezusavosufafata.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16074758ac358a---80745005835.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/79408411406.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/797662c25a6756f8d05d57ad100ffa76/madepudiwobobe.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6a5704510---14354604829.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/uc37gpa6rtn3d74sgvvqu18b7g/72777137887.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/6716173504.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a414de43c00---23839190605.pdfPDF link annotation
    • http://asahiru-ban.com/files/files/52038978786.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/d7fa990e95cb2f0795a0f52fe40bf75f/38186397575.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607025de93958---xemagisuxubuzeka.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/e4178c82e2accd579f838af2f232fa52/vikosivili.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_off00015d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D10 10760 bytes
SHA-256: 25891bafb4211e2b24e5129d1ba1763313fed99e3538b2290b687fc55ff2f5ac
font_01_sfnt_off000175ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E11 16596 bytes
SHA-256: 33d2511ea9e9cc3218260ed0ac0076aefc05c26fb7b0aba2e378600fe49a07f5

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