Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ed845a54d89c90…

MALICIOUS

PDF

91.9 KB Created: 2021-08-18 04:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b3e0c08f5d2f67ecd0a88492777d76a3 SHA-1: c9a411a9a290aa3fb0de4a34ea920d3f408cb724 SHA-256: 25ed845a54d89c90add840d85a5bcc8c3c6070169fe6449456c4d06fff850f01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as malicious, including a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and embedded URLs suggest it is designed to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://imreelectric.sk/uploads/file/giretafaxitorilujeramotu.pdf In PDF document text
    • http://wujipacking.tw/upload/files/bofori.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608004168ef99---50071053560.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a2f562d20---motabuwa.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/8895bde170415fad173f7dafd845852e/39207318224.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/90698383062.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/runezaliwikile.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/datovogaxotav.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/biburavafemuwitomekan.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec0a44842f---mudobamivarozepotozupeb.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/70776070613.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/21770866958.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3e9402dcb---36632043285.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/luruzivipelumekurodi.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd312773b9---64373532143.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/28848331891.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/lemovugurifesirawa.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/kufazexatijal.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021060216094073499.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/8c6fbab903a9aa02307e1abfbec684cd/widejoxoxuvubes.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/940abb7b3a6ad5082a7cfba5d6a8d326/634516054.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/7f46a37e9d51c6f9cbdb0d65f488acf1/rapezatogowojipogikufi.pdfIn PDF document text
    • https://aashianarealty.com/file/94056254374.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///65594633382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=como+balancear+ecuaciones+por+el+metodo+de+oxido-reduccionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FD 11084 bytes
SHA-256: 6625ddf24b88dd1621b6d0d7a99e64f4186dee94fd7feb74c04ff0a865934482
font_01_sfnt_off000101a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A2 18344 bytes
SHA-256: 7bfd64ce3372175728d36aae7203335c06c9440483bb1a0de79bb6aa939f04b0
font_02_sfnt_off000130dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DC 16132 bytes
SHA-256: eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8
font_03_sfnt_off0001464d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1464D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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