Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ffc861dee9b6f4…

MALICIOUS

PDF

72.7 KB Created: 2021-09-07 22:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d2b932a54c1a593f798822ac851dfa8 SHA-1: 6df3dec3bf4f99f811ce483f3b1c752645bb2e88 SHA-256: d6ffc861dee9b6f478288d2949fb4c9603ae3c08acddeb874ef488c7b494171b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a phishing or malware distribution attempt. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest the document's purpose is to redirect users to malicious content. The ML classifier and ClamAV detection confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://cructi.ru/uplcv?utm_term=pcr+primer+design+anton+yuryev+pdf PDF link annotation
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ec7789fb06---kexutovisilikeluxuvufun.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/62ed2883b6aa21dedbef1b7e293268b0/lofulegapogilurabelowaga.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/7875764224.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/17023407113.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/655cnvk9s1r6j7taumlnsnko6i/wivigugutabikiwizot.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160811de28690d---43078344488.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/62277664221.pdfIn PDF document text
    • http://recviem.ru/img/upload/giralizokobebikagivaxopew.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/45569524683.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/46496756829.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d4779210f---64291969704.pdfIn PDF document text
    • http://monroehighwildcats.com/clients/40160/File/jorixorukedulatawavoxolap.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/9676bb757806c2e98c6ed527ed4d09e1/38953807369.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/74498736353.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090540f59987---paxaderunonupomelig.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/tegaso.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/49461643295.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/53748635299.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106467f72b18---manej.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/fojefepamisitosazesoxo.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/51843824793.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/79288692335.pdfIn PDF document text
    • http://laduses.nl/image/file/47973592592.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/jeluwadewolorupa.pdfIn PDF document text
    • 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_off0000b935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB935 11200 bytes
SHA-256: 01670aa6b2a8d291a4caa5e7c11b34859802815b38e2d4785553dbb2e818f9bc
font_01_sfnt_off0000d348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5A 16332 bytes
SHA-256: bfe45fb236ec59b7b5a5e754c0ca6515e5bcc57406282f84c3c35cef14e35841

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