Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffe44230c42483ef…

MALICIOUS

PDF

87.9 KB Created: 2021-09-03 10:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eea666b19efbe748c620741611f74c8a SHA-1: 185984a8b8d9be5af6d25cebac2220a28d86ae03 SHA-256: ffe44230c42483eff0b520331b6be93fca226ea093454552d4f69a2e03b3659e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of a link farm pointing to compromised WordPress upload storage and other disposable hosting further suggests a phishing or malware distribution attempt. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krassimirtaskov.com/userfiles/files/gifefozajakuse.pdf In PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2106152259124338142pdebe.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/73353344847.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/dakujozitonebudu.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/524fedc7dfa5750e780582c9580274f3/mewadoriwisimiwot.pdfIn PDF document text
    • https://ibextrail.com/editor-images/lisoneneduwudado.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/77388359072.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/31274471412.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cbab4db138---nitusipepizumatinuvaxewi.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/32137234878.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/98401c9a153599bca2a1777b2a6e7d65/66876880044.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076d8367c85a---65034651103.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16077d373c430c---dapisagifijaropiz.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/315fmmsek342rr65su2lnhi7o5/57897889457.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/trcnkerb8vj4tt91oulc871s82/ziratovuriditumatujato.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/82161049794.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/ralelojolejudu.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e2b1decec---77432200181.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16121074ec961c---majaxuwujosimuvepojedij.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/egtr24nivglb1dffb3ujv84n53/gafes.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/87392724274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=reading+for+ielts+collins+pdf+free+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4F 10928 bytes
SHA-256: cb345760509312e0fd3c55c4587d95f363218eb7302e540ebbdd60d7c6e774d6
font_01_sfnt_off0000e592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE592 17784 bytes
SHA-256: 24f58cb9482f89a4a6c95ab3c4b1555a22168328030affff0dd651ffe98df753
font_02_sfnt_off000100cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CF 21468 bytes
SHA-256: 56e7ac2ac61b9c70980878dd7d9d48edac14f1b4331cfa35ffb2f2a72b020c51
font_03_sfnt_off000139c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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