Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ba12c235c8ad16b…

MALICIOUS

PDF

72.7 KB Created: 2021-09-15 23:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 80e605efc0410f38a9bcbd30100df9bc SHA-1: ac250947e8dba6622bc9209dac4b1113ead4d050 SHA-256: 2ba12c235c8ad16b5d27522f8372a6a2b15d6440a2a080250653fc6b8b8a909b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting domains. These links appear to be part of a link farm designed to redirect users to download files, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://krisoc.ru/uplcv?utm_term=fgo+english+apk+download PDF link annotation
    • http://suvenirzp.com/uploads/files/rabenabe.pdfIn PDF document text
    • https://ptogel2.com/contents/files/8423125412.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/rimunuresubowofofowe.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/61472166531.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/30060412234.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/domanim.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/wamonetozotidejokazod.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/nubori.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/zixibuxuseje.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/45885383162.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/88003710259.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418cf3123ed---36496629328.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/2484941233.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/40846158163.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/65224709206.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/7422594711.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/xazasezexexiriramejokonu.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/6829486580.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135fc78d180f---58852334154.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/30946987071.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131c7c7f338c---vazovosepilu.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/ninileko.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/gomuwifufafuzige.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/pupevadasadapobawafobuno.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/rirazoxovemasamuxekat.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/67938781176.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/purenotizujedatovevozud.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_off0000b6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B6 17724 bytes
SHA-256: bb6be7120bdbd04e3c8e6ea4587c6721f5c533978652798d234e0c8efdd0e4cb
font_01_sfnt_off0000e47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC94 10628 bytes
SHA-256: f52f0721bffb127b7938255a72a2e2e1f4d05394846195e21728f4a1e3794c9d