Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d853053edef839…

MALICIOUS

PDF

84.5 KB Created: 2021-09-01 03:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a435c8b984fe748946e280b11b1209b1 SHA-1: d5d6638d1d9d2571ecb36a9d18bfeca447a04958 SHA-256: 53d853053edef8393f9227d9e9615e887fdd6b15741375367641a40d8266df20
204 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it is a link farm and presents a password-protected archive lure. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, but the presence of multiple external URIs and the 'password-protected archive' lure strongly suggest a phishing or malware delivery attempt. The embedded URLs are likely part of a campaign to distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://er-cardiff.com/eurostyl/photos/file/galotibomalozoxew.pdf In PDF document text
    • http://files.ibiza-ferien.de/file/16258723720.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/26113997110.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/75784127858.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/jilaresu.pdfIn PDF document text
    • https://andrejc.si/files/file/14874696689.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/xarol.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/f334a6f0869007cb3e0ea2ccfb1dfac6/ganumerese.pdfIn PDF document text
    • http://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/89081765709.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/kizerivoxobijexe.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdbe4d5b42---kidefad.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/vanijazovunimu.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611fc1db1675b---tixodumuvulijadoguzitoz.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/noregozegulajuxulifowi.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/kavepomusazoviroburizet.pdfIn PDF document text
    • http://rideco.hu/upload/file/nufefagub.pdfIn PDF document text
    • http://arablift.net/userfiles/file/32223204993.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/sezutagawavuwalinuzapu.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/kulafixigosizatoj.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/76a86ab494fac388cde13cdd9e2b4118/47786522277.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/55020111051.pdfIn PDF document text
    • http://orderkai.com/uploads/files/kumuduvoji.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/dfuaaad861nc7taurtf42pkm3b/85095986850.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/nasum.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/59257988616.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/54f956c2eceed887971c2fc46bcacebb/45866374557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=download+wwe+psp+isoPDF 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_off0000e5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F8 18220 bytes
SHA-256: 5b077919b2c08633c314da7d36ad0492a0b91d0cf1b1fc6eb39cb4b069c07f25
font_01_sfnt_off00011521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11521 10272 bytes
SHA-256: 0d8c5f7f1cdf179dbc1c88d58b34a1dec06e462b69274a1ea2ec711495d2cec0
font_02_sfnt_off00012c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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