Malicious PDF — malware analysis report

Static analysis result for SHA-256 726d71c6c44b6af7…

MALICIOUS

PDF

97.8 KB Created: 2021-08-07 01:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 796451caa6c7be18c14ab9a16048180f SHA-1: e28b227ffdbf2fe129a0548fa2dc7d49e105cbb7 SHA-256: 726d71c6c44b6af7749d1eb5c18e990896893457df62895488a224e6c1dd1fe6
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. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious sites. No scripts were extracted, and the document body was unreadable, but the presence of a link farm strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://nktrading.qa/file/files/25257242065.pdf In PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/ls6o8tmlttmo278m30qu7rr6vs/64040575322.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/85346728446.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1bddac808---61424633270.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/6f4073f6051c5993ca13cec6b6a5a669/62610584625.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608efd075fe84---vibus.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/jo9bggpr1nqrcr3af16sj8nd03/94853460402.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/30855927789.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/78381525573.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/c91be6cfa58ebeaf5ad254c609a940ab/87987667527.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609849ec2dc63---pomilaritapufozofa.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/bolilixutamuji.pdfIn PDF document text
    • http://axwelindia.com/uploads/papone.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/92162908334.pdfIn PDF document text
    • https://epiphanych.com/images/file/zigoxidepudel.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/loruj.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/42872825566.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202106151926365086.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/15219015007.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ed1a5kkq52giqhib2vsjh4o75v/jowiwokisukajuwekajer.pdfIn PDF document text
    • https://teamcode.net/upload/files/5906153645.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/loh07osm0q46p1tjutchi6m0ps/6955953867.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/71175324544.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ece4237c550717421c3430808356d854/zaxumajeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+use+a+bunker+hill+security+cameraPDF 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_off000116de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF5 11020 bytes
SHA-256: a6cf5fed2f94db583b93a3bec939b263bd02b17ed6394593f32ba2c896716cb3
font_02_sfnt_off00014871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14871 17572 bytes
SHA-256: 891f6bfb22dea30b19c556e684d1216d94bbeeb02f50ea64d9dbe255f946d50b