Malicious PDF — malware analysis report

Static analysis result for SHA-256 60549e36c137b899…

MALICIOUS

PDF

81.1 KB Created: 2021-09-21 02:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 70a102358aadfbaec1e15cfcdd0ff4bb SHA-1: 93de9bd280ebc49a4c5a417636a9cb5765f6f715 SHA-256: 60549e36c137b8996512df05ff4d698556bc7e376e4062aaace9f64297911b3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to download further payloads or engage in phishing. The presence of multiple unknown URLs and a confirmed benign URL suggests an attempt to obscure the malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://semangkabiji.com/contents/files/jideg.pdf In PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/59525763164.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/141709245282.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143cb8553dd6---80609622989.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/78481669550.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/34552890052.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/af515bc884e7baf99b0c4e8866d888fa/sosugubunoxuroro.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a875485c88---dopimixekusalogogoke.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/vozapetufabulebapozor.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/4368087387.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/78878275699.pdfIn PDF document text
    • https://kokomanis.com/contents/files/7800659413.pdfIn PDF document text
    • https://mihalex.by/files/files/46896417722.pdfIn PDF document text
    • http://leton.pl/userfiles/file/dozofoperafewivizun.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/kisog.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/99454752266.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/fovuboz.pdfIn PDF document text
    • http://congtyvima.com/images/Download/63458217699.pdfIn PDF document text
    • https://netlandschool.cl/files/3596735457.pdfIn PDF document text
    • https://activepymes.com/pub/file/titupenavejigovufavas.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/2169540315.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///84198895153.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec81f838d2---83912036055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=chromecast+tv+apps+downloadPDF 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_off0000d6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CE 18140 bytes
SHA-256: 058037102bffa69d46adee3c3b08207c6fa9f60a483947cae6f7fdbbe31fbb14
font_01_sfnt_off00010592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10592 10872 bytes
SHA-256: 4c0113b76db820ad86d902ee7111444c76e1d2f2a9114542c511a161323a8841
font_02_sfnt_off00011ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1