Malicious PDF — malware analysis report

Static analysis result for SHA-256 3480a71953fa73e1…

MALICIOUS

PDF

76.2 KB Created: 2021-09-02 09:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0a2122a2b3a0231ce58f3712daa15a8f SHA-1: f5caf337abb895e438ccdd6cfa7fc4ef5d645be6 SHA-256: 3480a71953fa73e17e7ed5989734d077424daf385acfd894c0b97b1bde0199fd
196 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests the document text may contain commands or URLs intended for execution or navigation, further supporting the malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://savoie-outils-coupants.com/ckfinder/userfiles/files/rigizudodepijumokepewi.pdf In PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/095e9cce91e2f71a806c0cf2a6911b52/99468840634.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/tuvulaki.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a81bb8f5ea---70130634855.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/tizebozamuxurawamo.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/zowipovep.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/wufedovexelevebi.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/81831915985.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/f92fejsf5htrmb0rq97cscqbo9/40464819113.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/masamam.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/95152345363.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f3f4a6872---bexevobujozevijula.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c05940b9a7b---fajezo.pdfIn PDF document text
    • http://belovosushi.ru/files/48176945716.pdfIn PDF document text
    • http://secretinvitation.net/images/files/muvoxewisirexu.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/sazidedujomalovij.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/duxewizujamakawiraxozasug.pdfIn PDF document text
    • http://apvn.info/userfiles/file/sogoluxafojanuni.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/bowetuweferifogek.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081c416f26ab---difasarabog.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/sezesexoz.pdfIn macro / runtime command snippet
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160839d76628ec---kijixojozafekaji.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/bb9a96b032ec470e9e1d258f95a96a2c/46028997655.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/6ae426a632d1e7f662a6b1364743882c/jujele.pdfIn PDF document text
    • https://nam.it/wpIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=lcjw+price+guidePDF 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_off0000c737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC737 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF49 16724 bytes
SHA-256: c6df45d5a7f4891419e63dda089588d4efcf87c61e32ef3e6a5b49e9723219de
font_02_sfnt_off00010af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF7 10264 bytes
SHA-256: ff6d8bd844fb2ff7b55fc765b9366bf78bcc90244ba06ad7f82c0ec4a53c73ae