Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c544c2fc4ab980…

MALICIOUS

PDF

95.6 KB Created: 2021-08-06 19:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 756780287bafbe30a366ae0ca8f73ddc SHA-1: fbaf12cce9c1d97fb4c1edbfe0db76b1d194a713 SHA-256: e8c544c2fc4ab9807e05b6377b7f16a232ecb643be8d862d6efec13579d3d8e1
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm. The embedded URLs and the nature of the heuristics (PDF_SEO_DISPOSABLE_LINK_FARM, PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM) strongly suggest the document is designed to redirect users to malicious websites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

Heuristics 6

  • 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.
  • 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://auburn-properties.com/userfiles/files/90258727146.pdf In PDF document text
    • http://seibyou-koujien.com/files/files/48272237342.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/56868845623.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b6c4590c6---bagubivinumabeji.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608121f4dff54---nekeronu.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/gomuranusukamavato.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/3b46e2396191f54752897a4c43121a93/garik.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/20df4da2bcd246ce81b7e76ecc2f2e1d/guxifoxupavenitelusow.pdfIn PDF document text
    • https://umartravel.com/files/jafuwakoforov.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/29277804086.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/6ba3a0ead5d947a3180300eeffa7e44c/satosafavig.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/pafexumirekilelamejopi.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/zutigunogu.pdfIn PDF document text
    • http://allasclub.com/campannas/file/60235566484.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/fapezabajuw.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210608093148_jf3tzg.pdfIn PDF document text
    • https://edusfera.pl/upload/file/8835556566.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ace782d708a---9352953984.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/83701695119.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6ed48845---48007203373.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/94850599398.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021051617124_96639029.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/wukiz.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cff3bd9d8---1051499095.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/84634153216.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc36582ca8c---30473271449.pdfIn PDF document text
    • http://amitadevnani.com/userfiles/file/22665638518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+effects+of+poverty+on+academic+achievement+pdfPDF 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_off00010e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12637 10980 bytes
SHA-256: a2ea9eb7d5f0ae0d3ce92110b408c32f8d3d7038a5956b6541c40cd686f752b2
font_02_sfnt_off00013f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F95 18648 bytes
SHA-256: 3a8738beaa577c795fee54d260a24e30797a6a517c34a558393ebfea24aff16d

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