Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e79bb9170d526c2…

MALICIOUS

PDF

83.6 KB Created: 2021-08-26 00:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0df6c6efb264a0c965d2e9f939af4ec0 SHA-1: 80c9d3eef6a8cc77c732827250994c59ce8492da SHA-256: 2e79bb9170d526c23c1009ee96334973404d4216cb0c75dafcdae18f2de0742d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised WordPress sites or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL heuristics suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/zalazajexalajoxodubisux.pdf
    • https://fsreloading.com/userfiles/files/luroduvutev.pdf
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/9936000362.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a98c043927---xanejetetuguzaminadafave.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607255573e920---44236627494.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c07ae9c803---28449013620.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161145a3ae4c25---36253256078.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/bplidevajqhnlm54u98hnr8jor/sawatupoxujimamiru.pdf
    • http://oreade-breche.fr/userfiles/file/6623586597.pdf
    • https://synersys.fr/contenu/file/dizajazojamodisedidijofi.pdf
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/liwudaf.pdf
    • https://axlthailand.com/imagexx/files/96642060833.pdf
    • http://vivo-mebel.ru/upload/file/5472661807.pdf
    • http://naturallabs.fr/userfiles/file/vugefe.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/ae8412ad8b832802483879017a23c876/mabimataxitaxiwujebakir.pdf
    • https://nhanloc.net/userfiles/file/mitusosigimewej.pdf
    • http://sztarmedia.hu/_user/file/21056374086.pdf
    • http://mofrantech.com/userfiles/file/69640861325.pdf
    • http://ozdoby-betonowe21.pl/Upload/file/tasafuzinilirinubiwunuf.pdf
    • http://falerisztika.hu/tmp/bimez.pdf
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/47441109832.pdf
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/nuvekis.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115681d02e16---gemovubuwofebilulafo.pdf
    • https://loctra.net/userfiles/file/rowokisijuwogalup.pdf
    • http://cesurmakina.com/userfiles/file/9884181795.pdf
    • http://alirezamirmohammadi.com/images/upload/files/nawejosoxibiloluzubu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+many+pints+are+in+64+fluid+ounces
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e148.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE148 16792 bytes
font_01_sfnt_off0000f95a.bin
cb009b9eca1e1795851c68ac9861fd57c0b6f498055eac8bb1d46a99b5f6da6f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 16988 bytes
font_02_sfnt_off000125b4.bin
73fd543f0156a46a08cdcf7b8a7535a85c2fc3e9d407a7364dac2263eb6a838d
pdf-font-stream PDF embedded font (sfnt) at offset 0x125B4 11320 bytes