Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a13671d51ca36e8…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 00:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f4e5481a3669c6f3c96da2278ea35a29 SHA-1: 754fbcbadd0d9063a1a5ed7531a6a08c512fcae4 SHA-256: 3a13671d51ca36e8729337c03bb7361f3e9c5a22c0319f49560bc6a022979c67
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick the user into installing a browser extension or update. Several embedded URLs point to potentially compromised or disposable hosting, suggesting a link farm used to distribute malicious content or redirect users. No scripts were extracted, but the overall pattern suggests a social engineering attack aimed at compromising the user's system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://parfumerieindex.nl/images/uploads/62827227368.pdf In PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/wopadaxikas.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/73846870118.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4db59dddf---kegedifemojujubepubizix.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/49469182595.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/64396467482.pdfIn PDF document text
    • https://phm.vn/upload/files/24932044538.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/wukuwat.pdfIn PDF document text
    • http://qdjshg.com/files/file/99439893982.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/zazurexumugatesevemewuxin.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/kebikexivusuxutidefori.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/zuvapibe.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/1328916439.pdfIn PDF document text
    • http://mamitobe.ru/files/file/63202513874.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/11988862217.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210913124957187.pdfIn PDF document text
    • https://mar3ol.com/Files/files/nufeparivirusamapumabufe.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/togozavetekusa.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613821d614cf5---voxisinajokewir.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/wipafezuzinaginelazogezi.pdfIn PDF document text
    • https://ijp2.com/contents/files/15280967167.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/lukijorikufufuse.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe2d13f1ce---bexajobewagute.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614477a1c0fe0---40981215579.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/xamagifiduzaxufogevokunuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+stop+pop+up+messages+on+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_off0000dff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF4 10864 bytes
SHA-256: f0a8294207132306851d1e954947923ca83eea8cb3dcb8ad6f3110159bab844e
font_01_sfnt_off0000f8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D5 17904 bytes
SHA-256: a948f9aa8d2efdfbf78f06cb4cc818080c5b28e82bb09fbeca1e86820b887c7a
font_02_sfnt_off000126d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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