Malicious PDF — malware analysis report

Static analysis result for SHA-256 4258a6232f525670…

MALICIOUS

PDF

86.6 KB Created: 2021-07-21 14:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c77245a690e96aee3e6f8db8b7b17cbb SHA-1: 543e148adc23c5c2201da642fe8d4137e2814225 SHA-256: 4258a6232f525670b776c834a6db32fde787d2978a0966b536ea3195241d7d74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a coordinated effort to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984b44a5d78---56962690343.pdf In PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/923ef8912c1f9524cdf172ed37d31d05/88874879097.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/64761489929.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/bb4b6a63fb0ff7780e93603609c16c70/pewinawubunuwegagubexuk.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/29809262153.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792724b7918---80171073833.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/vozutupezobanalowur.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/58883721813.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb2c7550d2---81259833773.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/88311384844.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/govokebedosabuvu.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/127c2cdee5b7de10b80487b2553bb8bd/lowuridot.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/jsup4nl6dm6an7g54s8v5tolsr/nesixejomefunarojad.pdfIn PDF document text
    • http://proxima-design.cz/files/file/talejixonag.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/1bfd2ddacd25b5e1b319f9704cc39643/60138716300.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/16208535021.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/mozujipatimelutitesiwos.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/99897358403.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/57d72239a92e1b4b17d0b11aea897828/wededufedu.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/93986764613.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/39550917278.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/robasiwapasuvita.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae20d0c6e13---pijigamopoliritakiz.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/xexumovuw.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607722e7dec4c---38055383214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=polymer+and+its+typesPDF 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_off0000f147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF147 10668 bytes
SHA-256: 027c4ed8e73de539a94ca01c4bb0bdc4070ac636a019588d66c5f83fbf8d9ffa
font_01_sfnt_off000109b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B0 16752 bytes
SHA-256: ed40e49071d9eeffa376703dd0eb2949b92735bbf76172255a2cddf5982ec955
font_02_sfnt_off00013537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13537 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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