Malicious PDF — malware analysis report

Static analysis result for SHA-256 52634d2c43c9575c…

MALICIOUS

PDF

93.1 KB Created: 2021-09-01 04:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e64cebf5da328bc8029bb5580568301b SHA-1: 936653e4043b00cb3405c328104cb02ca19b94be SHA-256: 52634d2c43c9575cff47910d4e7d861771678e905f9946baba01e569ace2ea5e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, primarily through its extensive use of links pointing to potentially malicious content. The PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicate a high likelihood of redirection to malicious sites. The ML_NYX_PDF_MALICIOUS and ClamAV detections further support its malicious classification. The document's purpose appears to be directing users to external, untrusted resources, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://utuin.net/files/fckeditor/file/32662560862.pdf In PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/5cf6e05665763ff74787697e5f91fbe9/fizazawa.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/72717868465.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/d71a22120e089a0389b8ff7014f18d8f/zuxunoterutewejogamo.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3428f10f3---gofuraziviza.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/dazidogibafadefanavumi.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/0e7cac140381242b2da49dbb25204990/71776758455.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/gawetomukofodidugolaxodex.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/toxovatujojukepab.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/kenewejisoluxavu.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/dijbglk25309pd6n0mh8j2g7i6/dovojixi.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6318198bfe---65965822464.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/83334038374.pdfIn PDF document text
    • http://takeacode.com/user/d41d8cd98f00b204e9800998ecf8427e/file/sofewogelepadupugodubom.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/zibabujifimafubenu.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/wurikusufugudedapasodaloj.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/80598907455.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/tezogef.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad1c4c54be---84810670656.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/g79t9317t4ss6ikji2hmg396po/mogokikizewutosujap.pdfIn PDF document text
    • http://krzeptowski.pl/file/76347955732.pdfIn PDF document text
    • https://steammining.com/userfiles/file/wegenixutoboketofufevig.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/paralimarabamowuvej.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/4881755327.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bab108a0d83---8179577995.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/jetafakizojaxo.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1ac27e04b---rajosopoxogulasuvudefisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=categories+we+live+byPDF 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_off000104ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFC 18448 bytes
SHA-256: 7b10c4690da53927647574ba2f35f99b5fe02e878c5dd29b7a51bd32717fe490
font_02_sfnt_off00014cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC3 10616 bytes
SHA-256: 2ae022e2f92a88ae1ad0f4a68ec01ca5cabf40622f1b03b96110078cceab9e64

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