Malicious PDF — malware analysis report

Static analysis result for SHA-256 198441a7596b913a…

MALICIOUS

PDF

90.3 KB Created: 2021-08-14 00:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 743249e6adce9680f483e0cbd33db5d1 SHA-1: 93f4cfee57d6733c6cb597eb551129f485ea31e4 SHA-256: 198441a7596b913a958383655b31ee1771aee08bb922016b39086eb09c961831
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, pointing to numerous compromised CMS upload locations and disposable hosting sites. The presence of external URIs and the overall structure suggest an attempt to direct users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b206f0c5d4e---10559579889.pdf In PDF document text
    • http://thesetnews.com/images/fckeditor/file/83115235805.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/lixukojisipaserafubowume.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/25436521019.pdfIn PDF document text
    • http://amouage-salon.ru/admin/ckfinder/userfiles/files/xunexax.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d51f3b2b637---dipexaxataxolovoziwon.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/35933517452.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/6vboqdcr6tlfep0gkkkavtd6oa/93890004595.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/29297756483.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1839c76c42---joziviwemeworidizufeduvo.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0140b200a---gevoz.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b2d66b905---1528967717.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/kvca4ta8tespi0t7km4gfittu1/vigokavadusaxumavexipu.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/76721e0d89d8a22d7d8245274ee5a8db/47569571530.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/du23a7115ela5m3hgjs0l2n8hq/watunekirutofit.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/08af14abce2709be5980863d271d58fb/64339808219.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/pepuwewimemix.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/b99b8c3fc22bb7b4b371619b75c16903/58059769248.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/hhhq8us79ofuovjovsa6a70fi6/91501497056.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/bixagobivegageg.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/kmoae6vd350kmnco03812g3c1l/30132035619.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/darasanogofubiwo.pdfIn PDF document text
    • http://talleresjpg.es/img/file/posib.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/51285366551.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210712222155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=descargar+corazon+de+melon+mod+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BB 10820 bytes
SHA-256: 0c8f1d3dff1ad3a7d67760a2f7e9adf112ade9462f7d03e00d66224ceffa705f
font_01_sfnt_off0000fc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11495 18444 bytes
SHA-256: 233b134817fa497b22d40234cca80ce834d4c5893d9c075af30164f5bbeef55a
font_03_sfnt_off000143f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143F3 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b