Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87832a03965cc44…

MALICIOUS

PDF

85.4 KB Created: 2021-09-19 17:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5708348e39861f637b8c0729ea86e3c3 SHA-1: c93294ea3287d4bb46cc1f43fa323172764b499a SHA-256: d87832a03965cc4465a0c4fa6dfc49a4a5f340159121ed35b50cdb579084e547
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of a 'password-protected archive lure' heuristic indicates the document likely attempts to trick the user into downloading an encrypted payload. Several URLs point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to host and distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://jatechkj.pl/upload/fck/file/33699626346.pdf In PDF document text
    • https://zlato-stribro-investice.com/upload/files/ditidipemijez.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/winusobunedididapenezoxa.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210904_BA00B09257085948.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/88855392543.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xidijax.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/62319478661.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210918145503.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/kalezinidawudukewakirufeb.pdfIn PDF document text
    • https://jung-yeunjang.ch/userfiles/file/66339588073.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/jijijosesosijufexok.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/46836878587.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/6673302174.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/xogokeridaxatunajon.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/12209464887.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/1324c05217a6f40699680c23fab48ae5/3154298140.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/tibawiduvoburisog.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/luwilopavivigudepabase.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454a97638ec---xefinakakedizazajifaze.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/vakejewubim.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/rejofodo.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/15658517348.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/zazazigifoxogufuwedufezu.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/11065469163.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/wimimunukobemelunotiwovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pin+code+androidPDF 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_off0000e5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EE 20088 bytes
SHA-256: 0cea883940d64de77810224f6141c13ecd9697be4a0553f3c12eef9bc80b4f92
font_01_sfnt_off000119be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D5 10052 bytes
SHA-256: f8b3582ee5ba1f22294b2c874e102d5ad90da3cb43119a6a12698e481c2158e4

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