Malicious PDF — malware analysis report

Static analysis result for SHA-256 082797b98dfb15be…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 00:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1963b9372b68fc6763bc79e7eabdc578 SHA-1: 0064af00d5c0cd5f759dfb69d91021b3a5cea707 SHA-256: 082797b98dfb15bedef0f1ffa460fd2590c0a3ae538de0971c03c918e68806d6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised WordPress upload directories or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • 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://sanga.asia/userData/board/file/33868602313.pdf In PDF document text
    • http://murielbellhomes.com/userfiles/files/piwagazarigibazix.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/12087255960.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161344d547d6e3---witemusate.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/f76piio06gcjv0dfihdnteuk3e/90997942811.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/3052088938.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/monomitobuwewojasuremuwar.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/34668077345.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/909fcab72ccb5867c126e8140f7c4b3a/wologebowanowunifa.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b80ffa9c3a---fidorakem.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ef8b45a59---buxitabozeguvapunuveka.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/94521260647.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/kelukupuwalazasuja.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210914085148.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/kavekosipepazedawem.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/11406993840.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/mowijigakodidodet.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/64962557423.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/85216428718.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/dagaporuvanumegapibud.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/93328507297.pdfIn PDF document text
    • http://afslab.asia/upload/files/10045785444.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/pofamokanukuje.pdfIn PDF document text
    • http://qdjshg.com/files/file/pabapivujalutedusa.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/28303506888.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/99169928295.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/54647602614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=filipino+social+mod+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_off0000dfbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBC 18200 bytes
SHA-256: 64bca25d1f05dbfe429f4357c80322fecc51e35011f0bc90b79eff7e32ba9e4c
font_01_sfnt_off00010edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F3 10416 bytes
SHA-256: c4fec51e4ddaf3288e5a93c2026b4709c8391f7fd994107853b20bd39d099123

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