Malicious PDF — malware analysis report

Static analysis result for SHA-256 afdef21501eb80c9…

MALICIOUS

PDF

79.5 KB Created: 2021-09-12 02:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c2a423fb925bccea20e7e0b5d4a09963 SHA-1: 0131b95f58cae1d64c4421851fc06c2824001093 SHA-256: afdef21501eb80c95f7df211410ab84fb4a44c811e714d55a7e9383c3ecd593d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous 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 ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a common PDF-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://allytemp.ru/uplcv?utm_term=avg+cleaner+free+download+for+android PDF link annotation
    • http://lamorenj.com/userfiles/file/xotinojolomabaj.pdfIn PDF document text
    • http://yongqingtech.com/d/files/vikisapomixijas.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/85173364851.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/tejusafapifaj.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631006594.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/9c4cee7558b34b0fce8980134ffb2363/68283007829.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/10228898820.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/89660778096.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/xigasemigikox.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/3029157475.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/59821093686.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d157db09c2---wupup.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/gukolaxup.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/s0tpjf30hsgjf043cgiks71qp5/kejisabisewenasopenafidip.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7175d9956---39561460200.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/jababi.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109080630227663.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/sepozobi.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16133622b0e701---45320667171.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/xesokulimuxilefew.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8701bf4c3---tesobukutetado.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/52286059628.pdfIn PDF document text
    • 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_off0000d396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD396 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAD 10520 bytes
SHA-256: 6ba60a4d91f37fc1842cce75f6dcd6cee29afc04bae871fd208ef496d10ba247
font_02_sfnt_off0001039c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039C 16920 bytes
SHA-256: 7977221eb8bc5bbee05c7d9176a3d20c3ca4db4d75484602e00fa05e16779e81

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