Malicious PDF — malware analysis report

Static analysis result for SHA-256 a223b522e88dca87…

MALICIOUS

PDF

71.7 KB Created: 2021-09-19 18:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b212f7b949956ab4594d96e26094d3d5 SHA-1: 12bb9649ead8d8481a8dcc652553ead93de9c016 SHA-256: a223b522e88dca872c0f16e25dd04a4003da8a23757be08b579c9829c49eaabc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting domains. The embedded URLs, despite some being marked benign, contribute to a pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://medrea.ru/upload/files/18274403638.pdf In PDF document text
    • https://thietkewebseo.com/webroot/img/files/27706200638.pdfIn PDF document text
    • http://mweb.cz/images/file/10930513227.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/vixebuvokuxezirebemow.pdfIn PDF document text
    • https://xlquality.com/userfiles/file/purodokavikexiwerikebizu.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/13209474345.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/tolemibez.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/zobisolurelaruberevuwenej.pdfIn PDF document text
    • http://novafish.it/userfiles/files/83133793661.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/xeximexoxam.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6549e3cbf---5901001180.pdfIn PDF document text
    • http://glassick.com/userfiles/file/wawubug.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/pogamabixigexuz.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad57d06dcc---bizejoxon.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/lekavokapipa.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/kuzudak.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130fb20be3ad---74664894608.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/74569557098.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/supakateguwe.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/simuzujokosatilemu.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fb7b877c5---41703477785.pdfIn PDF document text
    • http://zimmerei-possert.at/50333065884.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161404c20c4152---31087464050.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/41146886607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=surya+pronam+mantraPDF 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_off0000b5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE9 10264 bytes
SHA-256: af361fb6b4aa5fe408ea9ca68c502ce621b7dce0053c8fa47b6639ffd69f5257
font_02_sfnt_off0000e501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE501 17524 bytes
SHA-256: 6de0d975e9e25307c6f421437ca44e9694d3e432e15ff754e6d4c66a1f81d88c

Open this report in the interactive analyzer, or submit your own file for analysis.