Malicious PDF — malware analysis report

Static analysis result for SHA-256 e491d533d738eb7a…

MALICIOUS

PDF

104.9 KB Created: 2021-06-17 09:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 325cc1b321e75f4d08bf3eb20c40b333 SHA-1: b8627f618e73d986ac1dd61c6c2e2ff45929e718 SHA-256: e491d533d738eb7a77aaaca262e735a65a02fab548a483fc954504e7fb5e6ff2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a link farm pointing to multiple compromised websites, likely to disguise the malicious intent and increase download success. The document body, though heavily obfuscated, suggests a lure related to 'stock control sheet template', aiming to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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 https://nomylo.ru/uplcv?utm_term=stock+control+sheet+template PDF link annotation
    • https://anukulagrotech.com/userfiles/file/kewirenepafetegitug.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cba36e34bb---99702715080.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/55722193693.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/35020852639.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981c1728a15---sedobigubixanexetikidud.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754d7e1e830---69421396721.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/66483541860a6f9fa3530b.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/77747543069.pdfIn PDF document text
    • https://promise-land.com/upload/file/dexawibovulemiluno.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/87893999860.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa769c8676c---bevemokekar.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/d52a1e359eeb578040ac25f2d5c7f001/11671401656.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc160171e---zebefumepepagifoni.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/95433674066.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/zavagufik.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607cce1fe5bb5---dagedakepumaga.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/13994349632.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fe820d988---68544885554.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C3A 5340 bytes
SHA-256: 99273af08310b876308e52931149d282c38edd8083ca29acaffd4fad8926431e
font_01_sfnt_off00016e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E3D 11384 bytes
SHA-256: f57297d359ff1d73660866e1349e404ed96432391e7d093c309e22793411a5a2