Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a66a00bf49fb180…

MALICIOUS

PDF

77.6 KB Created: 2021-10-05 07:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3cf0fc85ad101cfe2ac1ea3efba532e9 SHA-1: 92815597c62a9e4f258511386261ebbc10d8250c SHA-256: 1a66a00bf49fb180e03449b7bf8972fbec82f8543e84243e408c9c49bad01b34
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading further malicious content. The presence of external URIs and links to compromised CMS uploads indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/0eb57ebb0f2b7a8d5696b62df72b3a5f/70819522413.pdf In PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/48098247267.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/0593353f3bcc5cadd797a7fc33c58dfb/93474381397.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/98837638992.pdfIn PDF document text
    • https://majubesar.info/contents/files/luvevekuwanederasalebo.pdfIn PDF document text
    • http://handmade.sdelaemlegko.ru/files/userfiles/files/gusexelipidenox.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/xawubawejas.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed7bd2a0fc---91359390147.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/28209675328.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/perajirivo.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/937199493.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/90421734668.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/poxanunaxit.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/dodabipujesapatola.pdfPDF link annotation
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/46451018620.pdfIn PDF document text
    • http://usagimatur.com/files/others/54865240433.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130654f5f41f---32426570412.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614222f476ffe---vakipapapo.pdfIn PDF document text
    • https://777mto.com/contents/files/18497461695.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/madinotovijimizog.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/38476550881.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/2hg419jc817gvfscnndgdfpeks/xinozemibavamiwofemodof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pdf+archive+downloadPDF 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_off0000cbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FE 10460 bytes
SHA-256: d417a4d8f5900b43bc7c5772b438e8bab9271456a7725c50cd57db509200df67
font_02_sfnt_off0000fbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAE 17304 bytes
SHA-256: d7b0700990a3419861d006f8182c3207384a9b49a6f709f902cd133f13d25799