Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84fe90f680aca26…

MALICIOUS

PDF

91.1 KB Created: 2021-09-20 11:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8fde83b5f0a5a06e41ae9a6a87bb46e8 SHA-1: c03c2d0af885c4e0a4b58a88a2b64456939ec11e SHA-256: b84fe90f680aca26e87bb2b0b25d4e3b27733f5e11a6ee24eeeb4b0cbce59a65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting, indicative of a link farm used for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

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 https://inwebjor.ru/uplcv?utm_term=filme+one+piece+stampede+online PDF link annotation
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1b42b572c---78929332382.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/12675402997.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/pekulizowot.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/jobixuruwa.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/sexakik.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/5619351154.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/47864336973.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/kipumixup.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614468f64d979---36282483573.pdfIn PDF document text
    • https://viettrungson.com/media/Files/36071079017.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/38397774453.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/sulijunaraloguzetidi.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/84797047724.pdfIn PDF document text
    • http://zerosquareonline.com/file/96084674744.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/felotefol.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/c2473c848c4be813b593cb6990b57074/21167865605.pdfIn PDF document text
    • https://razredna-nastava.net/files/12305954301.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/31950901176.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/nobeludamanepojed.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2a073776a569d254d6bdc0a8a57b0798/simejajepaberinutidusufib.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/fiwiteratafikuzev.pdfIn PDF document text
    • https://birotex.rs/images/files/mulekofopefat.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210917185119.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_off0000f1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 10552 bytes
SHA-256: e539ae29d4b52c3e6dd8b8f1e406b8a830be9975b954227489a2ab4ffe3910aa
font_01_sfnt_off000109e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E8 22944 bytes
SHA-256: 8bf8529911d42452519a77fac9efced0335d6942053d2085d06780f9501de7c1
font_02_sfnt_off000146b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1