Malicious PDF — malware analysis report

Static analysis result for SHA-256 381867d5162e5691…

MALICIOUS

PDF

120.1 KB Created: 2021-08-08 22:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0bd7e8b8ada1a0666f55f9ccc3bd437d SHA-1: 16205f5e97b7ab3e3bb3b943f61a6a7dee06352c SHA-256: 381867d5162e56913b39050cca448b65c9d55daa80b593c4b5521df4f5a5b677
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://namphuctourist.com/userfiles/file/18797701100.pdf In PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/vadopilew.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/u02re94k2ood4ads8gdsuop1lt/rulanisibazisepuxesututu.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021061915280165.pdfIn PDF document text
    • http://zlato-stribro-investice.com/upload/files/68486194172.pdfIn PDF document text
    • http://3q1p.com/upload/file/210630124318156252yb525z81nx0n.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5e401a86128593030ac38d4b5a44bb6d/lirofexobetokodezid.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160960a50923f4---fupopexemololufujinuvima.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/rajogosanisa.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/bj88jpgj6q78ts3k492b2sg5em/jovobediwavunora.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/bac0d2f9443a21e4c880a141865b3fd4/pesaxi.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f81307c5f77---gerosarofozusob.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/xetolu.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/hpt9312fvho7q2d7h2pghpbqlu/bunapuwopalozorisi.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/49409153691.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/5de9ea9e75cb37e1adc729734b5e54fa/vubufe.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/renijox.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a65a546255b---53968986972.pdfIn PDF document text
    • https://paperland.bg/uploads/file/jasedoxiwowido.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/e6999f677148690a3d438d0c6908582e/nalame.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/56199272479.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/bivinil.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16082b4c54e327---17944454766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=psicoanalisis+de+lacan+pdfPDF link annotation
    • 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_off00017314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17314 10416 bytes
SHA-256: fb2884f99dcaabb6083303ddcf9a6cdbb576151effd401265026e572a479ad26
font_01_sfnt_off00018ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2D3 18196 bytes
SHA-256: d28b805ce1e4cec3eb1bdd79352b6df3f05b39da3c7674cd21e0fd1884118d36

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