Malicious PDF — malware analysis report

Static analysis result for SHA-256 be68e23043aad6b1…

MALICIOUS

PDF

79.9 KB Created: 2021-09-02 16:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aeabccb36073072f6dcce0a26700b439 SHA-1: 003b42dc48b3cc39971b6072fcaf31d1e58cf69c SHA-256: be68e23043aad6b1eea176ed19ee76ca1b1f3450c92f90966106fbbc9d977284
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs pointing to compromised websites, many of which host other PDF files. This behavior is indicative of a link farm used for phishing or distributing further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/ba6df46553c1b5800220bc4dade5d5d1/93529507582.pdf In PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-10/20210510043308452530.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/jeniwilumafi.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/joxiso.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/93489290051.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/230fbc2599d3ba716cbd4f48a6497e55/94443378455.pdfIn PDF document text
    • http://dentherapia.hu/files/file/navugufabewevowedizadikow.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/40b4dc8d7303b89680c9138656e29885/7660625954.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/donefagifosukiviton.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/82925536013.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608737fa1db72---61882589541.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/31067663474.pdfIn PDF document text
    • https://edebmachine.com/images/media/files/bobuxinutotikumasiz.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/23306027389.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/jokebetopijuta.pdfIn PDF document text
    • http://tochuchoinghi.org/files/2535317918.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dbafc19f1---sapafapidoxodame.pdfIn PDF document text
    • http://htwy.com/upload/file/37645187219.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/98796556197.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/61615922029.pdfIn PDF document text
    • http://erex.hu/upload/file/34549486633.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/vuzorufegu.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/wezamipulovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=aptet+syllabus+2018+pdfPDF 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_off0000d166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD166 10912 bytes
SHA-256: a10172fc6e52293f14e86b273180e4c905c061b6a954ddec990dba0a2b6b46a0
font_01_sfnt_off0000eaca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACA 18176 bytes
SHA-256: 1828a088107a258ca663a3e1653c415c3a49ed3552fdab9632b83ba0d3132ecc
font_02_sfnt_off00011a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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