Malicious PDF — malware analysis report

Static analysis result for SHA-256 998b26eea2579812…

MALICIOUS

PDF

80.8 KB Created: 2021-09-04 18:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4e6430730ec8725c8814504fddfcd15e SHA-1: 76970bff60bf957827b4ade49c0b5ee9741c2778 SHA-256: 998b26eea257981216197e32d83a56ba3c66ba27b9875c53b50ed881091ed22a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS uploads and disposable hosting. The heuristics indicate a link farm designed to redirect users to malicious PDF files, likely as part of a phishing campaign. The embedded JavaScript is likely used to facilitate the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://huntic.ru/uplcv?utm_term=bass+guitar+scales+and+modes+pdf PDF link annotation
    • http://popnmusic.fr/userfiles/file/jaxabolenalifurire.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070341172db5---2537213076.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2a49023278bd469f829248cbc0deb00c/zegezibavonu.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/a2osfts0p0rpinrbks2moa46svq5pmvm/fivizekevaz.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fd475203839---duxunifajowirixoxoni.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/681485226.pdfIn PDF document text
    • http://seritour.com/rsm/files/27762393093.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/c76c6e595e18a11e1f0e30d5ecd20083/84224365515.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/xufunirubotijujovitegusew.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/36395070606.pdfIn PDF document text
    • https://udruga-invalida.hr/files/dasewa.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/e639cc9ffa00463d5b259c8e4c01c053/54359865337.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edf191a993---nekogabap.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/potilosogose.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/dotenavililuxawububak.pdfIn PDF document text
    • http://alkanboya.com/files/file///23541058398.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/14884095616.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607e25ccef518---51597423432.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/43520429167.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/81693381284.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/20515442036.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///55209140186.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160cff683db502---52373020885.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071be167c36c---89060959494.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/sukerixuzuvosuxutox.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_off0000d400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC12 18236 bytes
SHA-256: 2e917eb3c2e9fe138919c8fbc71e082d7c6b6d21099cf030aa27f4eca3f8da47
font_02_sfnt_off00011b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B97 11116 bytes
SHA-256: fbc79cacdf2fdbadace27173d9481caed303995590af13a1ef5cf4b794af6f92