Malicious PDF — malware analysis report

Static analysis result for SHA-256 f956da6ccf885d8e…

MALICIOUS

PDF

69.2 KB Created: 2021-09-10 16:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9a17e7d1e775659a8f6efda5c5b146de SHA-1: e5221e53219c824b9f1a555602705a54494d703c SHA-256: f956da6ccf885d8e0df758f76bf17fd42df7f566eb87200b7ac6f0e99e66100a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised CMS uploads. The embedded JavaScript likely facilitates malicious actions, such as downloading further payloads or redirecting the user. The link farm structure suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://grandhotelushba.com/userfiles/file/44544159734.pdf In PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/jabukufekopunakixilu.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/teravenobanenat.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/xekifitezat.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/43529965981.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/10b4473b9f4367dae738c88d2029800c/81206412628.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/98997727611.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/2109061320053779058tnfm3.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/kilinarilabakokugagez.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/55392357768.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/71739371781.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613862816441d---32842708217.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebb1dc2ee3---zisadufemoraxanudexubus.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/51417826311.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/nugobonugefux.pdfIn PDF document text
    • https://el-tall.pl/pics/file/95159634942.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/38581546205.pdfIn PDF document text
    • http://iltorg.ru/upload/file/52137351845.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/4581980600.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/d3va1a4qqffneecag2p2eh3mvv/66110902757.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/xulozebewul.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/rakenebil.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/zamalit.pdfIn PDF document text
    • https://birudongker.com/contents/files/rogab.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/77702635144.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/63938171818.pdfIn PDF document text
    • http://furniture83.com/upload/files/88741680721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=smart+tv+pro+apkPDF 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_off0000b3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE0 14908 bytes
SHA-256: 47b9e6c630050e34e861d320c6ea4314a2f72b20202b2b4d480d43215f947c91
font_02_sfnt_off0000f0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EF 10104 bytes
SHA-256: d0b93d4cfb772f7b94f3d0f701d0bb7bc90cfffff05b557e095e985b6346a318