Malicious PDF — malware analysis report

Static analysis result for SHA-256 8072132f6374d531…

MALICIOUS

PDF

72.1 KB Created: 2021-09-25 04:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 13cb062fe570bcfae9ca4706302e514b SHA-1: 230ec5bb44a355e971042a2c592fca0de00aa1fe SHA-256: 8072132f6374d531b51b1a9e5336423ea3b84c18f5741d185cfcbaa6dfe2e4c8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form link farms, pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure suggests the PDF itself is designed to lure users through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://xycrusher.com/d/files/8686556484.pdf In PDF document text
    • http://baracenter.be/userfiles/file/mofixonib.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/gogumofanobofamip.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/bexowapiwizalozaduvotaj.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/82416729877.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/pezefagofukelixiriwuw.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/46539163921.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/99039397039.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/laxamufixipebebopa.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab67335f07---4910225984.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f43f8ec281---64397243835.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/fixenazetewatufevarogak.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/vetusogitaziw.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/97789671643.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/pejivogi.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614693ae8d608---42606141624.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/29681907812.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021092409442563.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/9962774967.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210922190755.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/95615304622.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/lojumeg.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/fumenikorudajevoju.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/bosibagum.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/bbhg8e7rb4mglum58g8d2jva62/54206388525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=whatsapp+push+notifications+not+working+iphonePDF 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_off0000b60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB60B 16668 bytes
SHA-256: 9c3352b193efc014ade07cc74d64c32d09754a77594e5d41d06b85d6bcefe54e
font_01_sfnt_off0000e087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89E 10984 bytes
SHA-256: 0a00e04dd8f283e24732ffd12b2476ef15c9ed31d2ed16a19093ccf53d68eefe