Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4f48cb65fc8c1e…

MALICIOUS

PDF

97.4 KB Created: 2021-07-25 23:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e49f2f9953e32c8411a38c5aa1059998 SHA-1: 80e1e663f9fc88ff6dcd93b8de51562f1968425a SHA-256: aa4f48cb65fc8c1edbcb850823dfa0af0c8516782fb40c771dc7ae82b3c624f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://angkoronetour.com/userfiles/file/18693470775.pdf In PDF document text
    • https://totounited.com/contents//files/23723456124.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b7417a69f7f---jesogamularo.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/donatidabun.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d950c9f9c---medos.pdfIn PDF document text
    • http://jar-ted.pl/file/gutixujonivaxuvepefugudes.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///mozulaxaxobej.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/88aab00fddadec29c6e721ebe3902b1e/78904466125.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/63012326633.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/27875161723.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800b968fb62---libawoluvipeduvemukadula.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160869784bafaa---89098301924.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d267d7b6281---fevusugovuwanel.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/bitoluvajuxigawenonozi.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/5aplgaisaqh4259skak8qsl471/49307536175.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/jupuvumotaletemesilisu.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/46c96ceac733fda0df44bce223f2ae81/41145084033.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/63365717734.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/24467bc71b432957f122a3334b15fbe7/belinorududi.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/c57d2a820d42669943e1c319bdfaa8f3/17091700570.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d1fb1a7f7---58123526319.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9e9861f24---55158084180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=reddit+news+appPDF 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_off00011968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11968 18136 bytes
SHA-256: 5968a1e99bb8f5c2067799dd166f66a7897daa1df6acddb943eee20cf4c863d4
font_01_sfnt_off00014890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000160a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160A7 10252 bytes
SHA-256: 16754d0b960905b3bff071661a0675479d14b9fce946ba453a9df427a47908dc

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