Malicious PDF — malware analysis report

Static analysis result for SHA-256 489821793d61fb7f…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 10:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 79b8a333ce51465b3708ca03ff0189b2 SHA-1: ef2b118478d2ee6b2c15a139f40abefba6e18e4f SHA-256: 489821793d61fb7ff9dda79819f98f8c6de9ceb936308d94003f3ba4d5593edb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. These elements suggest the PDF is designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://optimaglobal.net/ckupload/files/logufak.pdf In PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/bowimunik.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/42168433476.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/35d8fadba0ec217b28bc517ac50fc8d2/luvawunimovitakubovu.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/vabifubanoluvezetewo.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7cf33a635---48771863583.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/tv2ri9ss820taq806g2uttrgro/49878252482.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/ketigeno.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415bee4a0a3---20339483052.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/gikijode.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/jezijebape.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/2887373059.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/fogij.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/8f1c240433c2b56b179b351a98aa8319/jifinoresudibijijaf.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/22276875132.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/44121763960.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390778899ee---bogekokisag.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/70684513809.pdfIn PDF document text
    • https://tarsiman.ee/files/file/95542109619.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/25574150506.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/87270298020.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/24922725891.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210907_037DD05F2306A098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=mini+militia+apk+gamePDF 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_off0000dcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC9 10292 bytes
SHA-256: c98f55b6bfdb728b653550ba072e60a6018b68028833ee9d63659f83c582e08a
font_01_sfnt_off0000f3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E0 17708 bytes
SHA-256: af3a29e3b3373d9f638f19d5d22519b4ae4dd62bd9d8eda32294932f27154e47
font_02_sfnt_off00012165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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