Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ead2ab323a8152…

MALICIOUS

PDF

94.7 KB Created: 2021-08-05 18:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: af30c2df1cde6cf12eafc1c88935d2f1 SHA-1: 99099fa107ccf209f790efe6b1df383b57161869 SHA-256: 41ead2ab323a81524f8ed0dfe829756c41f91b5c220b189c0ad9ec387255cacc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing attempt. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://robertsrucker.com/clients/7/7f/7f5ecd1287ec2152c36a7dc1808edcbf/File/zokujogefubedo.pdf In PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cde022514e3---kozowaduriribu.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/lakige.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/49d1d0ed6b1f3a396b410721e5416777/54732207090.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/sivebubeboja.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/17803578342.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105a98b4ada4---7523992064.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/39681787602.pdfPDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c3ca0ef41---60048119094.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8329cd31c---fugajakunegotow.pdfIn PDF document text
    • http://www.proyecpapel.es/ckfinder/userfiles/files/xifujusetiwipume.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/wadapisizosatib.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607da15ba9d7f---8330668875.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/duxijixukapusesejis.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/gpvfh1l3a255qrki914kljpjqq/gowonumofet.pdfIn PDF document text
    • http://gakuso.jp/image/_ckimage_file/lunalorikegor.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b56c1c0164c---dufozimil.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/jus898gitit5eqoce3n6esfrn1/30143333168.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/ee06dd09cd0a843535f2b8046d432cfd/newabebuzukapagekumuve.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/38906959123.pdfIn PDF document text
    • http://chinalabware.ru/d/files/lazagekegiropirora.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/17935701426.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097a8c426173---wenuviteledazuxajif.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/78356070938.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/50481748208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=az+400+study+materialPDF 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_off00011028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11028 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001283a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283A 17096 bytes
SHA-256: 936f5c5c3f1a3f53dca40fb99339b89c991b356bc7edf8ccab56b10567b392fe
font_02_sfnt_off000154ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154CA 10640 bytes
SHA-256: 600c8614e138cb1ebbaa41160c48a8e86c12d88fa936427d3b4aa10ec4453a53