Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e847c0566589a9d…

MALICIOUS

PDF

90.8 KB Created: 2021-07-04 11:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7f918afd5b1e74231eaf6e80490c1ee4 SHA-1: e8f0e32fe1dd74ff0ec126b9c5aaa024629a18b4 SHA-256: 5e847c0566589a9ddf3d94435b6c8a17fe1a6c75088f06818f9fa5dd0732b946
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Static analysis revealed numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting, functioning as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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 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://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d58bd8162---rezalefufuvobenu.pdf In PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b84d9a2b71f---kakatajulokuvezibaberalow.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/e756a7e30252d1765789f77135659c41/55865703505.pdfIn PDF document text
    • http://www.empresshasnoclothes.com/siteuploads/editorimg/file/mijiwav.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/16118984170.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/73218615549.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c60cbb8f167---kamebowutumudosinevozudiw.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/gobizubobiganadakumamut.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a325cb6efb2---66425510423.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/97097661177.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/wunugogapigapusoxulebepo.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da405d58dc---24755006924.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210520092312618859sy8nvc.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/753677de5bc8f4ae7191c121fe1c2c5f/zabomekig.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/4380052231.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/buxufolorevireje.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16075a15555e01---zolozigububugemenorekumo.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c7d048994---19185889424.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/99829759918.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/69284382975.pdfIn PDF document text
    • https://europartner2.pl/uploads/78237573326.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/71442288841.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/ea82fb372237343e62472ae05acba471/nitotewa.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d970c5226df---13988184458.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca4e8bdc9a---3900400287.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/28823554485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=tenant+in+severalty+meaningPDF 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_off0000fc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5A 18836 bytes
SHA-256: 10539b6aec3ff58fae918a1c877e3009b635564adaa5ee4fdaa489503daa7741
font_01_sfnt_off00012de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F9 10472 bytes
SHA-256: 15ff7e60c491c2289bb136ee00e96dd225fa50158dc4086ffc7e3329e23a591c

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