Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d7ae42426dd4a35…

MALICIOUS

PDF

83.9 KB Created: 2021-09-20 01:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 369abc6441efa6f788aaaaf071134285 SHA-1: ed03dcada7387fbaed3916e3ae56b11b2209760f SHA-256: 4d7ae42426dd4a3527311776116a3b81fc229eb59ca3561441c3bea15e16d435
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious content. The presence of 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics, along with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://drafthe.ru/uplcv?utm_term=xender+file+share+share+music+download PDF link annotation
    • http://anquocrealty.com/uploads/image/files/97771588977.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/46503275893.pdfIn PDF document text
    • http://kco.su/userfiles/file/86031869108.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/79798919456.pdfIn PDF document text
    • http://kmsenior.org/file/files/14391940592.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/45226136626.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/40949445838.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/futubor.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/66019877112.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16138dca206ac4---vigaliwej.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/34726592557.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/98477785468.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/vamoxejufizuxixakuxapidom.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16142562f74069---66452363138.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/lerotilidixobotejozuvusej.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161407381b4757---39583801988.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/2764059004.pdfIn PDF document text
    • http://qdcmd.com/data/files/39138702651.pdfIn PDF document text
    • http://onelove.cz/file/jobowemuxas.pdfIn PDF document text
    • https://tekartltd.com/upload/files/92197263283.pdfIn macro / runtime command snippet
    • http://teamhead.net/userfiles/file/81250951541.pdfIn macro / runtime command snippet
    • https://oykufestivali.com/ckfinder/userfiles/files/99991600929.pdfIn PDF document text
    • http://onelove.cz/file/joIn macro / runtime command snippet
    • 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_off0000e0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D7 10836 bytes
SHA-256: 27803b212f35a8a9cf87d216608476697148613d0e69062f0446a61954db673a
font_02_sfnt_off000111a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A9 18568 bytes
SHA-256: 0e63a191dc00dd168888f653a0f5f4bd9d1c0b24e83160debb3f2e6402b9a602

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