Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3cd7234b5195b1…

MALICIOUS

PDF

88.2 KB Created: 2021-09-15 22:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f0fc8f078c7ca6a716e5fd7770c8936d SHA-1: d316df1408e7780d1acb5934701ba63ea9c274ed SHA-256: 8c3cd7234b5195b122a1b8325fa12f2801f953bbcbfeac5f8ac3c328eba0314c
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=watch+fast+9+online+now PDF link annotation
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca7f6e372f---raputimufelebofuren.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/kixeteluwemu.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/nimezovixor.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/lusujezipatisim.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/diop2geheavjbivsjfgu2fo578/54887427706.pdfIn PDF document text
    • http://badgerhillfarm.uk/9944923955.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/ribupuwomojinodaf.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/90528651862.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/60928625520.pdfIn PDF document text
    • http://ecoevopublisher.com/files/upfiles/file/rubawisobubenexojaso.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/28801686008.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/22910836190.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/bupoluvak.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/92bihbccmisgub1hvjndhjp8m1/22701850362.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/14/80442733738.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/tutinupunosuzik.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/dixudesedabupepozutalujoz.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/72355397333.pdfIn PDF document text
    • http://hflchw.com/upload/file/32711534249.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/pevimomokonowoxubugutef.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/69520645811.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/xodipojekudogi.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_off0000f2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD6 10580 bytes
SHA-256: a275d9b07a473814e9cf64e0d607326b4b4165b979944e434944b67ecafe83bf
font_02_sfnt_off0001230a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230A 18716 bytes
SHA-256: 5a74c8bae637e6892b31c732f812ee2f0329931daff680e1650900b8d97aeeef

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