Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15d6d83406c2750…

MALICIOUS

PDF

86.5 KB Created: 2021-06-22 22:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8c7378f6930403e4684f25155a27b91e SHA-1: aa9eba4742e53610f88b2cd4048497a4a5505c5e SHA-256: f15d6d83406c2750620a98b79f294875fc3011f3af59692f3244ca45c5efb4b7
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external sites, many of which are hosted on compromised WordPress installations, suggesting a link farm or redirection mechanism. The document's content is obfuscated, but the presence of external links and the high detection scores indicate it is designed to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/58baf660fa2c4a25c947a1897404a9b1/14590015647.pdf In PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/29711763838bc147005f205ea4ef170e/66971991340.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ec9c51d9f---6335401636.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/ranidi.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/99400b46030e6b908d4900b2665c1f48/62820594386.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/79c1acef4e50dcc5cceb0b6aece4efa3/8199134556.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb9976cec---40018474886.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b971778a1f---89753471800.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/bifema.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/bidonegokadikifagaruw.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/xekamivixosovoxi.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/b353bbcdeafa496dc5cf9ffe5d7d9764/17638803125.pdfIn PDF document text
    • http://diacritic.org/travel/app/webroot/img/files/70665631452.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/zunotawusolaw.pdfIn PDF document text
    • http://chongros.com/userData/board/file/3160376872.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=csr+job+interview+questions+and+answersPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BE 5188 bytes
SHA-256: b1e957a7af03d3ae75595dc20891b8a9b90196ccae2333ecb557db19bd6f721f
font_01_sfnt_off0001197f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197F 11144 bytes
SHA-256: 6e5c7eb4b6fafbe7ae62a2621237cde5f8c3f811945ef593ed8c45455b42da47
font_02_sfnt_off00013ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBF 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378