Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb6efaa56cc4b36…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 23:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 159d02baee3edd0c82517827f308c115 SHA-1: 030c0dc87006d1b75a077a1ddf8088cb8583e525 SHA-256: 4eb6efaa56cc4b36eecf9918947f2e2acc961e26b42ff2309e16dcf189df9d82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.iieng.org/editor/ckfinder/userfiles/files/wotaji.pdf In PDF document text
    • http://kirilmazbardak.com/userfiles/file/90581918775.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/peramaxilijebuvuragavon.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/xutowexodelelesa.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090922335273499.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/25245584945.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/59154458276.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210906051318537392475.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/bagafukezogodagegokor.pdfIn PDF document text
    • https://matricula.arendic.cl/files/wakugazu.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/91204049941.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/39294331291.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/suwaxulen.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/mofadomunifeke.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/wevagu.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135e480c1577---zurutobuvikupojugibo.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/2614040555.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/870e502461625f876acba18c493e5e68/8799547106.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/dixofisumabuwakarekew.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/p5uj7677n75ij0pt2t5ojlodhf/towotibune.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/28428739231.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/62971848738.pdfIn PDF document text
    • http://altinay-law.com/images/file/46461344983.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135d848cc5bb---lowixozajupegagadavizagis.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138c1ed5f401---vupujebabigurekexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=unlock+modem+smartfren+m3zPDF 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_off0000dc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5D 10876 bytes
SHA-256: 895c2a4800af39917ba62fc6a9720a8db31e1dd4ddcd98e17b9e0fee74c1f890
font_01_sfnt_off0000f599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF599 17244 bytes
SHA-256: b62fd961feae7b354ac961196c1e27040f6ca6c8f4dc7bfa7106199002e53286
font_02_sfnt_off000122db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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