Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16fe51dace3b408…

MALICIOUS

PDF

73.1 KB Created: 2021-09-13 20:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ffc6056d39230a4cbaabe56b5da63152 SHA-1: 3a2c20a15d28817a274ca6e9c81f4db97903fbf4 SHA-256: f16fe51dace3b408b1bafd5963535d45bf6c402aad857722f35d0fa1c94573ad
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of multiple external URIs, including links to compromised CMS uploads and disposable hosting, suggests a phishing or malware distribution scheme. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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://inwebjor.ru/uplcv?utm_term=dead+target+new PDF link annotation
    • https://apz-arte.com/ckfinder/userfiles/files/10720823953.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/nikifizemafufosugalepuf.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/kumimazoturewubegakebejuv.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/kinegedekotamavetozameko.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/82579659046.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/xepilo.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/55455663682.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/zoxoribe.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/loweb.pdfIn PDF document text
    • http://abwrva.com/uploads/files/63242116658.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/87646418181.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/sezexewopebamaxasemipowiw.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/fajofelavuvasidako.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/puxelibapiniresodugogoge.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/27647181522.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/e1677151bdc1159ca943c8ca4f0a95e9/10163375679.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/jazavenolibipavi.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136693fa5347---63207758257.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/56581158704.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f8aa2d447---55804314109.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/muminoranajamawupigewa.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/93247888322.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/83240650055.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/pesufisunazezodobarejinad.pdfIn PDF document text
    • 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_off0000be37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64E 10084 bytes
SHA-256: be8990db1ac30414b4aaf882e1078e2b9db58388e438ce4e64129f842750198e
font_02_sfnt_off0000ecbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBC 16448 bytes
SHA-256: 3dd3c1a8ec7d5318701465b77631aa38119c07973650a36b6091eccca8fce4c3

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