Malicious PDF — malware analysis report

Static analysis result for SHA-256 7862229a70c8eeea…

MALICIOUS

PDF

68.3 KB Created: 2021-09-27 07:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2d246629a1ce2fc2b49b71172241b422 SHA-1: a25bb8dc41db6d4d947c3d68627c5e6ba6b976b4 SHA-256: 7862229a70c8eeea6c05b7d8b6ec1754ab3b5b9c5870c750efeaf9d641806ca3
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. Heuristics indicate the presence of a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to lure users to external sites. While no scripts were explicitly extracted, the nature of the URLs and the 'link farm' heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=super+nintendo+android PDF link annotation
    • https://guineaservicesproviders.com/gsp/files/90800436963.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416cef38484---xiwoditilakuwiribapimug.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-5/20210905134822266818.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/lagavavug.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/4kufe0mqtpch5auapt82kmajj4/nizupunanujuxozuruvip.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139f9c186ca2---lobojobipilajebonaxo.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/farina.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/gonuvapamebumidofowapavu.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/45880484090.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/97597765782.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/gawarumifidodureda.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/27160178059.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/71685823587.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/xiziniwudinonoradutelebi.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5e618b616---xelatavumamusagenex.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/pidef.pdfIn PDF document text
    • https://scmsgroup.org/ckfinder/userfiles/files/34892970156.pdfIn PDF document text
    • https://autoskola-scp.com/files/dosikizepigobokawobuw.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/41502179795.pdfIn PDF document text
    • https://socardan.com/userfiles/files/fadumiwefopazugagemenuwel.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/2cb91efdc6696156fa4330083c9ee6a3/55993124494.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_off0000ace4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACE4 10344 bytes
SHA-256: 92459b47e19411bf8da919fc21cefc7c7bde064e930f74c1cffe81e47a119a85
font_01_sfnt_off0000c453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC453 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC65 15588 bytes
SHA-256: 1c22eab91f577f590c4c0ad6c70d722ebd2f0545d334cca8d2859e97e5b17cd9