Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae087ceeff8af44e…

MALICIOUS

PDF

85.0 KB Created: 2021-09-08 13:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a03c46a7027aae1d24132c073ff28785 SHA-1: 9733403220a9b768cdd68e81b4e82c7df3c06643 SHA-256: ae087ceeff8af44e46c30061fa62559d64de3832dab3913d0e5e899835637771
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is part of a campaign to leverage SEO or compromised sites for distribution. No scripts were extracted, but the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://allytemp.ru/uplcv?utm_term=mending+wall+poem+analysis+pdf PDF link annotation
    • http://palyavalaszto.hu/teszt/upload/file/1956878166.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c030bb7c8---24928319648.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/19653859684.pdfIn PDF document text
    • http://odumakus.com/uploads/files/48042756607.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/webaxojotomotasenu.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/denakekokor.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/piruwobixuveg.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/betelimiw.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/40555638597.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326cef8179d---bevelegavepabazogagat.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/43130259423.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/52045448823.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/60510532693.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecfea7e88b---48906177481.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/71988416690.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/71861663432.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/kogapazoxomurumufuze.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ojmjv1sjim36rtidfe505f3i7p/gireruluxutodimurig.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/rekagowusaz.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/87092225121.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/46079093846.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613602ed66821---daxetezubidawefuv.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/89079208195.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_off0000e4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F9 10836 bytes
SHA-256: 87b326ae795abaf0aacb0ca59cc9e5958869df38c2b89272123f9af31556b798
font_01_sfnt_off0000fdc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D9 18812 bytes
SHA-256: dafeea819a0d2fc05ecf5a41bd6dc7987f849abc0edd50831265d5b8a05d52a1

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