Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3198d8ab2bf534c…

MALICIOUS

PDF

73.0 KB Created: 2021-08-02 22:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c53f83458abd96f80bc29a8e3e1d3641 SHA-1: 580d1952507a8df6f92f7800b54f179c412d27ee SHA-256: a3198d8ab2bf534c44f3a318b36f21a5fcf9efa594e1c08d46dd9348dc7db64b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites and IP addresses, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/a0d77c0dfa2f126d2336c22f21f51e20/1013240316.pdf In PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/42161358428.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/t2koo7i8uciupm3nojtsm0pm23/vevasorebokabujuke.pdfIn PDF document text
    • https://aedwea.com/upload/foto/14900991606.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/munatamevudosojakab.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/17ehc57935nf3jlv631pjsgal7/24696956335.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d8c9b0234---razibapupisofe.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/fawegijabodeluvejonawezo.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/47646709580.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/miditolirenaruzawiw.pdfIn PDF document text
    • https://eventspicer.com/ckfinder/userfiles/files/78261678779.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7c5f9e4e3---kateriz.pdfPDF link annotation
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b98839e1cf0a8df92c2b7f86b0c9126e/vopofejija.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/6260254280.pdfIn PDF document text
    • https://abeess.com/userfiles/file/gegitaxotuxudo.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/mojijekevezumokiwoju.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d09b09bb540---rukibex.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/saeh5b287c8umnbftopha0gfdf/wekezeju.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/karepugoxezumivupizepopo.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b285bc432ed---zoxuretimokovet.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/35957988027.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/pajirakije.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/11e6225b8dfbae8ab0baaea603692e87/tolexofanigisidofesuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=mgr+sivaji+rajini+kamal+movie+mp3+songPDF 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_off0000bace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACE 10952 bytes
SHA-256: 7aa99a0c4734d04f2fe71c9fc1682cd2a2a1c3c8a3406c1da7886f2ce9f6cc49
font_01_sfnt_off0000d42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3D 16280 bytes
SHA-256: 13e5fd270897350d3238fbdf36f2995d9c3dfb87202929bb77f02a60cce09a66