Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2ca7769f151673a…

MALICIOUS

PDF

76.8 KB Created: 2021-09-28 03:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 85c7b428848ed9b63c832d258ee76dc8 SHA-1: b1456c85050f05eb900e200e9d910554025f1e86 SHA-256: f2ca7769f151673a79ba54f17f2de33a0a2955fe8fd4b1d10da678e36deeeddd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely contains instructions to decrypt a password-protected archive, a common tactic to evade security scanning. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is part of a phishing campaign, potentially leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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
  • 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.
  • 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://st-stephens-church.com/upload/File/90051126501.pdf In PDF document text
    • http://narnivet.com/userfiles/files/zawuremujo.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/bemekofegox.pdfIn PDF document text
    • https://12shio1.com/contents/files/92178517566.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/10403458914.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210926_06C5237AC171300F.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/mumoranaxudanixudutogofa.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/volaruzudenuzupi.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/73542889512.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1bc5b7681---ravujuvewinopukubemaziti.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/webizanevajumakolujuvol.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/75655519744.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/8187494321.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/9e10c8b201274ccd4265a810ff213999/romanarisupuxuguxutifax.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/fajemirubavuxududakat.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-21/20210921114637534331.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/17938067356.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/kibidagabozirikowo.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/gevelas.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/17892574149.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d08a8d49b---dumisiradapimenotid.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/dosinuboxed.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/kiruradavoma.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/26802072408.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/0ff8c9a39d99c2bd2e625fd05606e278/pirefodonax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=password+unlocker+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_off0000c3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AE 19232 bytes
SHA-256: 27978088cbf307c93273b6d07396dd26ad157faf0adfa645d723d65ab7639a18
font_01_sfnt_off0000f59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 10544 bytes
SHA-256: bdf14ab9af67fa77cee7da0f563fc5ada288d62707a90d54bba9f90774839b4b
font_02_sfnt_off00010dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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