Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ce3c609f85bb4b5…

MALICIOUS

PDF

79.1 KB Created: 2021-09-11 10:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c003a075702036fc9632cb9bf13c7b55 SHA-1: 5dc4aeedb51e6178856308837985071968c6116e SHA-256: 2ce3c609f85bb4b505b28dcf111c0811407d317b3b8d3c9f2eb9e8f9e36688db
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://riolisboa.com/images/ul_files/file/JBSVds4anrf5.pdf In PDF document text
    • http://kzlo.pl/fotki/fotki/file/74196194130.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/73302073814.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/59137318178.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130b11167eea---regitimonovoxajonef.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/20312446331.pdfIn PDF document text
    • https://ibericadearmerias.com/file/didaluj.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/54204189662.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/86901074278.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ebe125cc1---safojovaresaxerujisam.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/vedajekod.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/jajonaxokoja.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/62369770964.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/18765989975.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/77150640211.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109060053405680.pdfIn macro / runtime command snippet
    • http://jumpstart.mobi/userfiles/file/xobafosuza.pdfIn macro / runtime command snippet
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/43158013045.pdfIn PDF document text
    • https://ijp2.com/contents/files/kevojexepexudude.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c295bccfe2---31758620951.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/9392213581.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/78470922412.pdfIn PDF document text
    • http://studiodispiritoIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=video+editors+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_off0000d14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95D 17884 bytes
SHA-256: 12c2d03e8434c730646fd68952092981c244f19e3a9995fe2964066edabeb8a8
font_02_sfnt_off00011824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11824 10296 bytes
SHA-256: a965b39dc65297d4b0aa2b425c3b098f6cbd1b2cce858eead90f6043488b704d

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