Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e47dea771cbadb…

MALICIOUS

PDF

82.4 KB Created: 2021-09-14 01:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f0272a57671bf9efd25bbcb81b70ebf5 SHA-1: aeff2c71df14488cf32f562375232fd0c48852a8 SHA-256: 87e47dea771cbadb99b89136ff8d968a5123c5e67c805eaf8a83161bdbb8b456
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection suggests the PDF is intended to facilitate malicious redirects, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://inwebjor.ru/uplcv?utm_term=real+world+mindfulness+for+beginners+pdf PDF link annotation
    • http://rideabikenews.com/user_img/files/19688743113.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/47834712929.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/bisowenurikubabetabixorur.pdfIn PDF document text
    • http://hueide.com/upload/files/3539654313.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/62857896792.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/35689864939.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0c596eb95---91820806911.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/zisubidibomigarowope.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/45c067ad8fc3ab7f1b737f1526ac599b/mujozijepivogugajagaximo.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/21243464917.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/56261255088.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/xenajakijijuw.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613648363150f---rudiwox.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/58559784504.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210914054350.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/72407502447.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/nagulerifepusibavu.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/43769932935.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161365956586c0---jisaxonadarenegi.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1631549101.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/18570544429.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138012e8afc2---rewaxutixerepuxamil.pdfIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA00 18876 bytes
SHA-256: 5915f1bc4d95e280d27b781de190f505644e0e2c1fb829493bbdc77f046ccdd0
font_01_sfnt_off00010a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A4 11112 bytes
SHA-256: ed95fbdbfd2a03c976201d7f21861b8001fbedd53143197aca5aee9ec8d2785b

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