Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f9348a8b2dc445…

MALICIOUS

PDF

105.4 KB Created: 2021-06-26 18:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bc63046f9c00e63a78d48fd98d9e8e01 SHA-1: 4e6984268928aefb9846bc3768a72886a5108657 SHA-256: b8f9348a8b2dc4450d837e8af4d2d8d39290f5e49abe32bc2e20ff7c4bb2d62a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The presence of multiple distinct hosts and the use of disposable hosting suggest an effort to evade detection and maintain a broad attack surface.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091d42ab371e---bukugatawaborilonotiri.pdf In PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f174c22dae---31598285456.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609be10f30486---46035808035.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5ed36ac55---65423028525.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094a5b31a1cb---menav.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c18e8c99e9---sikipewipuriwamazokefe.pdfPDF link annotation
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b7c28637a64f0082efdd4e17ddcad708/livoxobulipajel.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160851d54abab8---sanolosazudejikavuvosunam.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/043f48015f19b3183094bfb4e2a5f852/pizixetuxujalefebakitibo.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/tagesulumenotudoxojagegep.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/07b93598d619c5b9811f73704b84c0d6/5862419794.pdfIn PDF document text
    • http://drjoecarver.com/clients/49355/File/67320910110.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceab3dead5---xetezozerevofixutozuxiw.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827fa5c2997---32575167399.pdfIn PDF document text
    • https://migger.dk/userimages/file/34552115720.pdfIn PDF document text
    • http://snsi.jp/image/news_file/kubivazifodafusojiradudu.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bd70f380d17---nebipotevegimi.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/cs990d5ffp1fm27ibrrf5cvjao/zirofofutolovevixugipowo.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d6362b3b266---fotimexowopekuga.pdfIn PDF document text
    • http://iphysiology.ru/upload/sukexazivoneruluwire.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/ripoge.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b87597911a4a71284e703fb3c2811dfd/nenifobipojow.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/womamutakufomosuke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=planets+visible+tonightPDF 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_off00013ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC8 10492 bytes
SHA-256: 0750ab2c523a1227fe8f9939bce9c089cec0da50984af7d3c9d60909ee7a59a6
font_01_sfnt_off0001529a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1529A 17576 bytes
SHA-256: a65535a7767d7632a360ee8b751c576dafcc68a22aed526027329b9b0de58bcf
font_02_sfnt_off00018082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18082 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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