Malicious PDF — malware analysis report

Static analysis result for SHA-256 101764ff05b8aa8f…

MALICIOUS

PDF

85.3 KB Created: 2021-09-12 14:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cbb6a93774912ed6d14966e26be5ebfc SHA-1: 8401e5c7b7ceab2366c2c7f97d3360973740b118 SHA-256: 101764ff05b8aa8f5cb3d83e2c25e5a8a9c6214ff5bbf6269ee3e6c2049d9266
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to potentially compromised websites, suggesting a phishing or malware distribution attempt. Although no scripts were directly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://insfilings.com/skyzone_classic/upload/files/muberuvisubiz.pdf In PDF document text
    • https://gianlucabruno.it/dati/upload/file/11270206948.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/sh7lpe4ob5jb0nk3k5arnuh5lv/20942815889.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/xawezidovuxa.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/sufumokaxadupidewot.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/ferufaretagopanexu.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/6a6cea24ee56b838015efd65c20d1d28/35868639472.pdfIn PDF document text
    • https://partnermind.cz/images/files/rexitajogulumus.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/zugowaxawupujow.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/32603445919.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210902071831.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/zejozo.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613005f572b93---dinekegegokixetu.pdfIn PDF document text
    • http://jonme.net/ckupload/files/zubewotomez.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/mitekuronowavenonegusemo.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/96488059321.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/nafisoliri.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/6922942149.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/genizarepukonewutosove.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/jevuz.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135b12d6d5a7---weduzopivegibukudezupo.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/bojodanavaxexoladivule.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/koxenuzuju.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/vegumevare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=unearthed+trail+of+ibn+battuta+downloadPDF 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_off0000def7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70E 10616 bytes
SHA-256: a4ee932957ec581edc77cfb78bb01dad888e40e3d3792675517e2cbedba9d3f2
font_02_sfnt_off00010f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F35 21204 bytes
SHA-256: ddeab6c5e9ccdf20295627331885d2ce2c6bf2a8875b25dea0edbca6cc943e17

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