Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe5ca20f2e6d1c8…

MALICIOUS

PDF

142.0 KB Created: 2021-08-05 06:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d620f5ad063e9bd88372f1dfb3c47754 SHA-1: 0d70326cc772eb0d9c55fa7dffee3265a3bc7323 SHA-256: 7fe5ca20f2e6d1c8f59c00e3f2697f0a747e8925e2de6689990b1890a7f9cffa
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate an attempt to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://corpusbg.com/files/fck/file/39088683934.pdf In PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/a97476541d0641decb94d65ddc8682f0/fawitugapavonuxedove.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/050c3c50b659b3fa6b4864b7dea7e75a/87669294409.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/biguxes.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/4368332484.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/90267322886.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093d888b30e2---fumaxejanojofabado.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/70259194443.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085d2e4e4def---kikizafajusugepofap.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5fa2710a38---53016723602.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160b125181d0bf---rivexoti.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/p9d3lkhejfsr1193gt2jl3sjno/rozixem.pdfIn PDF document text
    • https://ms01bet.net/contents//files/dunasofanamazi.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/wexatuvopenavuzo.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084d23f128bc---71525608655.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/939a18dcfd0ecc2cf22056e275a84824/degadaxexekegelufulidabex.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/dijegujuwuwononawaje.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48a4e27254---xepes.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/25798559516.pdfIn PDF document text
    • http://cycling-software.com/files/file/20286723128.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/30874562605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=fyodor+dostoyevsky+demons+pdfPDF 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_off0001c857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C857 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001e069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E069 18556 bytes
SHA-256: 329c31a93313ed62114efecbe40212e50f654c78f081c544f841082bd804aa7a
font_02_sfnt_off00021034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21034 10608 bytes
SHA-256: bb176217812cb211927b923c90eeb6e08b270a96d57e7ef88e1c684f4994982f

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