Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce7afc97824d3557…

MALICIOUS

PDF

72.7 KB Created: 2021-09-18 14:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ca05cba23f40987b8d75154119b62145 SHA-1: f4478bbe63b2160cc7ddfefc8f569951e9cac354 SHA-256: ce7afc97824d3557785cb8813ac2e1bca384c90fa4c44e2de05258bd53895ae9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous external URLs were extracted, many of which point to compromised websites or link farms, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://rajatotogroup1.com/contents/files/lovokinoji.pdf In PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/zetizorinulisaj.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/xasakojabitipu.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/1cb6777181b7529a9b517de78d7d288a/79682092576.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/lobovegedekezijuniwugil.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/danobepapew.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/sk6sktnbln18m5snrqj94vqlq4/68238363517.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/51098159523.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613772bbbd314---tuwezobobojaxagusebe.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210901_132237.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/58856798503.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/3168505325.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/lixaf.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/64855002991.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/zuwipuxaseligixumejal.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/nikoxirovolifebodo.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/niputebof.pdfIn PDF document text
    • http://elitacasa.it/images/file/dazivozegugenixuxe.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/ac76d1b70770a04a37b306ce510913ef/nesuvulubinomofokoz.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/83883504244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=my+hero+academia+season+2+episode+2+dubPDF link annotation
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/gugukolukexi.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_off0000b8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F7 11100 bytes
SHA-256: 345b25c26afc3c8e1ccf7311c83396c63b8ff15f1dcf295f76f2bd139c7ad301
font_01_sfnt_off0000d27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 16648 bytes
SHA-256: a1d958f16b0126ff43bab373573b828b2df915a18ab4d66a77f581228c266c4b