Malicious PDF — malware analysis report

Static analysis result for SHA-256 06c4ac1735ff087d…

MALICIOUS

PDF

83.7 KB Created: 2021-09-21 03:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 03999db4004ecce370752b4d538b6b04 SHA-1: 08be22a852798be208d57fe7cd3d2af088ff3e84 SHA-256: 06c4ac1735ff087d2d6ea0b884b2d827bb3f9d8e73de4278b9e1d32ecd9d54be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://garglob.ru/uplcv?utm_term=movierulz+free+kannada+movies PDF link annotation
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c9631a3e809f01f29549c9809156320b/webupoxexasowalijodeviz.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614110bea3341---fakitaranudutuvile.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/46710335383.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/76632897663.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/93063241776.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/35639932440.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/tuzukuxuzibiresir.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/ripawuletozolapupufosufe.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/pme6ok6tem8kmepj8pd0ekvvoj/koler.pdfIn PDF document text
    • http://webbuilders.com/files/file/29604367752.pdfIn PDF document text
    • http://vipdiler.ru/files/file/fofigasawajudo.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/33250096116.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/puruxadejusepewox.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/xizesu.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/39428607229.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/zowetobulirafovozela.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/jegedatodalubodepanu.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/81214030814.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/69379181605.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/96697604735.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/savefodetujofe.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_off0000e16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16E 10728 bytes
SHA-256: 0ab931552aed5520db9e929f15f45713deeb997e938dbf8f83e6296d4d1980e4
font_01_sfnt_off0000fa17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA17 18036 bytes
SHA-256: 068453867d4fe2ea9dfe94b3b58775efcaa8b10f23d35b9f0a45dbe9db29ba64
font_02_sfnt_off00012954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12954 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1