Malicious PDF — malware analysis report

Static analysis result for SHA-256 4772fee5119625de…

MALICIOUS

PDF

97.8 KB Created: 2021-07-09 20:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6652888a474292f7000311e9f9161bbc SHA-1: a54a212fbcf957e1f11e86b41958a126da44f1ec SHA-256: 4772fee5119625dea905e018a0791e5f6c8215fbbd9be7b18e984fad7ec64fdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate an attempt to direct users to potentially harmful external sites, likely for phishing or malware delivery. No scripts were extracted, but the overall structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a1fdb8909---16795901158.pdf In PDF document text
    • http://tatennis.ca/clients/29257/File/13118175290.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a01599144---donodegakodepagexizuvu.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081953c9d5b3---75957461740.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/bomatogovokugixozorelu.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a8e6ea49b---86492412471.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/muzagasot.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2476ec4eb---pifexurefutiribalo.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/64457253116.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/fulijonifu.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/bibarejufimewibakuk.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebae4703e3---74755560972.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/71421073483.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/b7f600a7b30875dc4e69be521fd81330/65375430572.pdfIn PDF document text
    • http://reinforcingourheritage.com/clients/0/08/0860c2a235168fe7e4a745c824023bdd/File/xegoporupotizabagise.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/f82105bc0527f7856ec9894c8dd3a676/filarawixafigetopapev.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/21174417698.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/32236272954.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cec7c1464cc---duxovukewazumegamemexefe.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/ximamufaluxenetuvefutere.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160719ddd630d5---80670075900.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/kideloz.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/605c7c08dc2507b3c54ce3288713f82d/mefusowimaxuzopopip.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-1/20210601224413664253.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608126abb51b6---geruxerixilikutoveduxot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=what+does+dwu+stand+for+in+textingPDF 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_off00011840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11840 10868 bytes
SHA-256: 34413d993e81cfbc2128ab1d98e5ddcd38cf3be2a960740acb99a989fbcf8b17
font_01_sfnt_off00013130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14942 18404 bytes
SHA-256: 3d161b512187d8d973278c2d08f57ffe658665447ef9b2ef7dfa0c50801c2c7f