Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe6572be962c423…

MALICIOUS

PDF

75.6 KB Created: 2021-09-18 20:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 183456eb3c5fa3feaa0320cb66c493cc SHA-1: 5b369af9628a2bcfc89ebb489958951d350f31c7 SHA-256: dbe6572be962c4232a62c5747b7c2d76e6fa764a3749437dc11712167ada35b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the nature of the URLs and the 'link farm' heuristics point towards a phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://flairpens.ru/uploads/file/53192102062.pdf In PDF document text
    • http://wixoon.hu/upload/file/wojofitevinapaxuxev.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/72763474910.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/75866367608.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/zaxuxesegan.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331e0ba4787---84822622759.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/geletarobanazojelasok.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/dijamujunuzakoletu.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/16969778226.pdfIn PDF document text
    • http://jfe.hk/userfiles/96068522568.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/86104680253.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/39808356309.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/5d256b72bed7e1d94f7ee786ffeb2ba8/76955166218.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/44139916289.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/wisesi.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/xotuvolezebuniliv.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/32079628207.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/bupalujivakaxog.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24661717440.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/wesigejefose.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/lumilopilad.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/78539578658.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/73d51a383f8b3f61d020bdf8a51a6298/baguzafabujezixokuj.pdfIn PDF document text
    • https://glozor.com/userfiles/file/50747873302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=simple+heart+diagram+without+labelsPDF 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_off0000c2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FB 17176 bytes
SHA-256: 2b544b29ba132fc06bdf30effa9d0b4b801734649e6b741e5aed85075d452dde
font_01_sfnt_off0000eeb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CD 11136 bytes
SHA-256: 8ef04da6397a90aa55040d9902944ec85a174424db9bf2bc732a57d5b95f3547

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