Malicious PDF — malware analysis report

Static analysis result for SHA-256 d982c99a426ff013…

MALICIOUS

PDF

88.8 KB Created: 2021-08-18 01:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5a2065e65d4e6543af34f811fb153772 SHA-1: a752c7397c60d3dfad6927c0a2f931845efe1e3a SHA-256: d982c99a426ff01356ff5adf28c06bf67affa2f911a6c9428dc0c9530af5c015
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://portsreunion2021.com/clients/b/b1/b1889431de095b9710a1303a3c619afc/File/3224262158.pdf In PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4eec4df462---dumifajit.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/80014181562.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/nuwezuvekeb.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/farejiwevinemolefuja.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b18438be44---giporogemegimisezova.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/2ik33t3gnpmghe6fg1jlkp04jj/jedagoladibiko.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/b09ss78p7oqu81lff7su1vaao2/7169865941.pdfIn PDF document text
    • https://jetaime-shop.com/files/80361634936.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/zerotusemikirulajapudigex.pdfIn PDF document text
    • http://dothi.info/images/files/risexalup.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/004c4eab9fe10f40fbaac23098097ac1/wobateneda.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/79761199358.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/99919354136.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/fimomiwax.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4048bba559---24153941238.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/496353f0ea451b430312e6da71fcb869/wurusi.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/35344570357.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/36170185764.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/rirofimoput.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/599981edbacf8d547284a5fed5a4e086/14116315294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=significado+de+el+sentido+del+gustoPDF 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_off0000f10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10C 10728 bytes
SHA-256: 81a01872094917c6a5f92cf71eb5db1d6dec002130619b2ca5fa992552d1f58c
font_01_sfnt_off000109a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A2 19308 bytes
SHA-256: e447948fa63cda661b62ec094f1de2adf45ae3f2b63a0aceeae0d577de490748
font_02_sfnt_off00013b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1