Malicious PDF — malware analysis report

Static analysis result for SHA-256 99bd7826b8517e34…

MALICIOUS

PDF

77.1 KB Created: 2021-09-20 18:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cf58dfd4726a5105aac1d4e28f819dd7 SHA-1: 459e1b25f3fa38bc54d56e2c524356911c9081ff SHA-256: 99bd7826b8517e3463b0684a18e416516d74f7b4011975e0d00e96e8f9f9542a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of embedded JavaScript, coupled with the ClamAV detection of 'Pdf.Phishing.Trojan', strongly suggests malicious intent, likely to lure users to phishing sites or download further malware. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 7

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=cricket+pitch+length+in+ft PDF link annotation
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b112ebee92---40383275783.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/79302533069.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/depoteziterovotafigupibuv.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/72343441023.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/39826944875.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109151538417512.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/rexaz.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/zipofipokimi.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318bb71acf9---wesedokazofitopi.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/bezaridutesida.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/82052312728.pdfIn PDF document text
    • https://riwg.in/userfiles/file/57998290809.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/binoxib.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b70f34a772---19023855327.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/16431865289.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ch0vesrnslfolo0qe1ak2jjs00/81644206620.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/ribikor.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/31803879155.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/dupuxegabizabumopivan.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/29443370321.pdfIn PDF document text
    • http://4bx.pl/public/file/susineris.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210911061830280388.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/48437755905.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/ludirujijuwijatizetu.pdfIn PDF document text
    • http://riviera.az/userfiles/file/35089306612.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/16611022284.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/52414899521.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_off0000c7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC7 17752 bytes
SHA-256: e6b2d1236e8940712eb71792472c784f95b30dd397c21f7b7716708fd0a0056d
font_02_sfnt_off00010e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7D 10432 bytes
SHA-256: becdd8e647f5dccd0be326f3df811fb9112b4fe59771dd1f8d47bb446e4ed894

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