Malicious PDF — malware analysis report

Static analysis result for SHA-256 202240f49f76d365…

MALICIOUS

PDF

85.2 KB Created: 2021-08-17 06:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7c3ca0f4f01384852d84226368bb05c5 SHA-1: 0a8ce651ab87905f38f6cad54abb64515d32e2bb SHA-256: 202240f49f76d3650b6fae18d83a80665de2293fe42733926c6982d365444122
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV strongly indicate maliciousness, consistent with a phishing or SEO poisoning campaign. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://mirai-kankyo.com/userfiles/files/zemanatifavefaw.pdf In PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/82118972078.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/vewugukesimufod.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ihaufc2ji3qq7hhhsuejnhcso7/vuxupefefitu.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742803666a2---4399590081.pdfIn PDF document text
    • https://vpmemorial.net/images/file/19066955580.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/48784383665.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210624094237.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790e8e4b761---gulorakawasinezapenip.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f9bb0574dbdd0c881d1dc8d9fdd95083/rafozaresu.pdfIn PDF document text
    • http://amandamaitland.com/images/file/79387692461.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/55184077468.pdfIn PDF document text
    • http://barnesfamilyre-union.com/clients/52050/File/37749244469.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/vagijizig.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b5eead376---xotenogikizaf.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/b115fbbe5bb93f8394161f9dcc4eb14a/98123789964.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/tvtl0obov19iv1ol6vvebrokj5/gipenovolarewon.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/wafinoxufudidafevinaz.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/48457618863.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/pijexazifavakokuporifepiz.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/gmrtub51m0ogjdsaar66g3f8i6/74224157806.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a288413d6e6---jepoximevimujowolibe.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/47439940640.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/pajoripasolidos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+contrastive+linguistics+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_off0000e655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE655 17848 bytes
SHA-256: 2bb969428f3c3d47752846ea9344343c4aa65d6fd41ba1e3ac2725c376867c2c
font_01_sfnt_off000114b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B6 11060 bytes
SHA-256: 17d1c22622a9a90a319d9bc090f7a1ed21b843012c99d1778d12d834ff76a421
font_02_sfnt_off00012e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1