Malicious PDF — malware analysis report

Static analysis result for SHA-256 b648d2792767f0f7…

MALICIOUS

PDF

83.7 KB Created: 2021-09-05 08:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ea877a35fad2990a589c78f8c2e5693a SHA-1: e3512cb799680815755ec2b9c3892598e3e3cd6c SHA-256: b648d2792767f0f77dd4a62a22ee13939dc5d2e4b9bcfcefe3e6705b3ba48bc1
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to redirect users. The presence of these links suggests the PDF's primary purpose is to direct users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://laborke.ru/uplcv?utm_term=digital+assistant+grama+sachivalayam+notification+pdf PDF link annotation
    • http://placc.info/up_image/puvinumixeja.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/japo5gl4meink4t8gua4jvgrb4/wezagedaramutagojusexamaw.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f687c25b13---9097424989.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/40316088916.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/33103455939.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/90355014113.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/tasetawizoboz.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/nivetawu.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/nefimuluva.pdfIn PDF document text
    • https://realschoolspirit.net/scauserfiles/files/supokofixebatub.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/78297212909.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/69893647317.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/92823eb2fbafd77fc1a48908fc92f284/wovutodinar.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/zulinazesutojafule.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77b6e9a5ba---61972433703.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/1ff5313e83578603ce12b317fe685a88/65602848079.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf335a420c---15213020029.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/73139793389.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1621843940.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87390992ab---fiwakurapadinilisowo.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/zoluxosepikevesa.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/20550313219.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_off0000e0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AB 17940 bytes
SHA-256: c51630141cace7f3eb646764845ed1a0d3930c1023c3c99ee7f670df27c3ca14
font_01_sfnt_off00010f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F04 11116 bytes
SHA-256: de82512b1ca0aef34d7fbcc24cf69348a101b878c3a6569353ce8da42696cf28
font_02_sfnt_off0001289e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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