Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2d2064dc3bb0c72…

MALICIOUS

PDF

83.2 KB Created: 2021-09-02 10:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 621fefd730b993e646d29ea06d28a56b SHA-1: d3f199da2fc71a0aef79ccdf23b6361bb1c03239 SHA-256: e2d2064dc3bb0c7256923f014d99c4c904040d9bb2fe6bf0ebf4fdb3f18ff702
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as a link farm hosted on compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were directly extracted, the structure suggests it's designed to lure users into clicking embedded links, likely leading to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/p65hnc3fr6t0qq9kl6cpup3viv/gewelafulotego.pdf In PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/54a2b601db1880a66f97559c90ab5845/2369545255.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/61710458309.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc1a620d61---80061407749.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f8a492c4337---bugaxewijivazajo.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/12079244674.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/wamakozizorabifezopone.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/65628647320.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/mamugorevozosupudapefu.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/69861433435.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/pupopekavape.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/tivikexuvuwuxifi.pdfIn PDF document text
    • http://stromzeleny.cz/file/napefupudawebowotek.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/78570638418.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/b4171a02cc7d212e9a15ce27daa684f9/64414949360.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/0f834d922204b7bf1e32a1eb5d4cc822/mujudirofemuvum.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/zizix.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/6792619024.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/64011b5efe3dac8610db763e16ee5da6/75284928383.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc7498c6c0---60635393524.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/s0mucdmmqv8b6ra37rkobhdv0l/lujadabixowo.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/67040414244.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/wesesemizaju.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/44501844632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=turtles+life+cyclesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#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_off0000e814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE814 10120 bytes
SHA-256: 0635cc5fcbe4b2bce8cb918d24b7712d39f76a15c652c202727660fcf03c184b
font_01_sfnt_off0000fedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116ED 17960 bytes
SHA-256: 3c0f0f6ffdfa10b7c85931534ca6deedf00e5fb8549472cb63d1a032f8bcd56c