Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b0d1e6037f40a0…

MALICIOUS

PDF

85.5 KB Created: 2021-09-17 20:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a866dff08802c7424cb62e35a1121543 SHA-1: aa3a7c7cc92d56aabec10503e2c9f127cc5512a2 SHA-256: f1b0d1e6037f40a0afcf0dd9220ecf7722e3491e8db8a60e0ef88c2626342af9
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous unknown domains, suggesting an attempt to redirect users to malicious content. The presence of compromised CMS upload links further indicates a malicious intent to host and distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://valencia.thepokeluau.com/uploads/files/15750611788.pdf In PDF document text
    • https://agatanorek.com/files/file/pugakan.pdfIn PDF document text
    • http://kgmda.com/upload/files/pesefu.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/35905576130.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c4f4355a8---gatibagixujiwetiw.pdfIn PDF document text
    • https://servicepapik.ro/files/volevelusiluz.pdfIn PDF document text
    • http://bienbao.net/uploads/files/35179804061.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143315d26125---lasufudonujevisexu.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/60659710766.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/nisibedepaw.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613879b8959e0---kenenomowarabajadojurir.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/junuzoberazonozuvomo.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b0829a300---45213910475.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/wuvanevifovujaginatado.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/91270727104.pdfIn PDF document text
    • http://digifast.cz/userfiles/87462561758.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/pewuvapem.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/ragil.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/29882969491.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/74199349776.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/4dbea9512e81de9104c168991d096369/gixanumupaferuwa.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/68471559748.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/5583382681.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/96956653314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=minecraft+pocket+edition+1.15+0+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_off0000e30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB26 10856 bytes
SHA-256: f9ec6cc2ac50ed0c63a93e690353abd3ddb164474b38ffb015a50397bc6b06fc
font_02_sfnt_off0001146d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146D 19796 bytes
SHA-256: 6bbd4cb99bd142c148c0f914e396a7a93766d6136f46ea102332ae9516d6d89a

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