Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d401b4e8ac0e210…

MALICIOUS

PDF

94.4 KB Created: 2021-09-01 11:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 838b607853f4ed5c47d5993a5940e622 SHA-1: 7031cef0d14da228d00a2f5addc92f2538894a71 SHA-256: 9d401b4e8ac0e210259a275bddbb4f61ccab9840102903b23fa542b11ad23d90
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the structure and URL analysis point to a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://romangruszecki.com/uploaded/file/nusagi.pdf In PDF document text
    • http://rszm88.com/upfolder/e/files/20210812052802.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/zozawutasadil.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160862a93b4d66---95858501261.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/bkk4p2o562bln4qcm3e2tn8e94/8596186900.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/1ok82uv5u29efcqg1abqfleqqg/pewuloxifaradupu.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/aeak82svft3uarf3lau0klvbs6/wolobaruwexajekogepefuse.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/firadefomuvixapoxapo.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/14801873628.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dee371ac4bd---vegerawupadoxirajowezez.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/xewodovejudagopijiki.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/sidixabipokuvuwovebefu.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/94232b5ca2d83f6463ea341c9047e993/guzilabadesolesebosolelub.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/domebomixinasugupuka.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/bejim.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/57923859485.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/73006404878.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/e63de167e9be12c8fef601e1f526fbfc/kejafozubasojuzom.pdfIn PDF document text
    • http://ativn.com/upload/file/nafagabinepupiguvusimer.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/gebaxowosozoj.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161004a22dd512---85178587714.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6feff0f2f---41058596075.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/11494049402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=profile+page+design+html+cssPDF 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_off000108a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A1 19076 bytes
SHA-256: 69bfe95c8aa667b66e19b95a1fe1b529c94650f3c4b99417b6b98ecfdaee67e4
font_01_sfnt_off00013acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000152e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152E6 11068 bytes
SHA-256: beafbe0711b4b0f7d8147be40d8e91a981aaa99547bef258a87783bac8d161f3

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