Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb207d28249b4fd…

MALICIOUS

PDF

82.3 KB Created: 2021-06-11 19:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5e9a219da30bf62789dbcfbf79532a10 SHA-1: ff76049f51d59319d2888d26649adcf3280925c6 SHA-256: 4fb207d28249b4fdacebaeee336d7a9078dfe2a31257705736fbb91963e9be91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, which are commonly used for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to lure users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://garglob.ru/uplcv?utm_term=m+for+images PDF link annotation
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/a65f2821d2fded9965385868f1d3e4bc/xetit.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/c1koi7dck12kvoo9p6hb14c8f7/gofofisuwuzuvasixubupopi.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/33342366748.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/1f9bb4dc2489d18fc0f29bfc68888804/15593005590.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/e3fg6khiejneo2bd0d32enb841/kipipilojiwirakanupat.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abdd3be13cc---dajimumofeduvepigo.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/cb64424d3c9990f7224268454de8e553/49100784842.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/delomamotezo.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/0p0qgc5oi5uaa3m6g82i2iv8tl/66244274562.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/ginanuvogowotudozo.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/jhma14sjlkphs5l5re1v5rmc23/kopiridabibewa.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/1b4e8ce245a04e41d797cbc36edbff7d/vobuwavilije.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/gakegejojizav.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/be03c1cf2a0de1b7e97fe35fb22e9323/femas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011f29.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11F29 18016 bytes
SHA-256: 51a20c4dcf99d7bf354cd1bf87a9783ca26109c91cfbd07225047a361121aac9
font_00_sfnt_off0000e983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE983 5060 bytes
SHA-256: 587d1b9222079ec42bd5bf5f8777fe56b0c6688a709fb647ff6ed49c40277ff1
font_01_sfnt_off0000fab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB3 10752 bytes
SHA-256: 278f7a821e7a36b71e77ebd73716ce29afa8a90a81715071b608cad0d5cdca55