Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e921ef0dd0ace3b…

MALICIOUS

PDF

77.8 KB Created: 2021-09-01 02:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 95cf6389ff9494404cca2cff62ead37a SHA-1: 40bff597a31a2a0e2c03c040c9ab97d751928083 SHA-256: 8e921ef0dd0ace3b8f7d5b779d6f10b92c4aae2dd23be913182f2232bc889591
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 https://inwebjor.ru/uplcv?utm_term=flightpath+aviation+english+for+pilots+and+atcos+student%27s+book+pdf PDF link annotation
    • https://aodaixuan.vn/app/webroot/upload/image/files/35090724051.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/31644663137.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/janarizudofafilotapax.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606eac2fdc38f---48320905107.pdfIn PDF document text
    • http://computerdoki.hu/user/file/sosidolugituvipa.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/35963614954.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/rapajewon.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/30459944610.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/zejawisadumewij.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/tazafomegawovikoga.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b84dfd1e3bc80488cf48d7329724f336/siputefezovalolanemanemu.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/b06161b704e89c9ece616b56c8099bad/nenodagojozobajux.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160968ada656b1---tovemexeporedagibalon.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/47772514372.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c51c698cc---36405243769.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/nebosirusodesa.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/xadavamirojewuse.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/gowazujelesud.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/wasezofoxatonizizegakuko.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/renulu.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/20495339949.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/45874013359.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/83124720675.pdfIn PDF document text
    • http://ibb-online.ru/f/file/ruzipekopejubipo.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/xoxowufobepawotaje.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-07-10/images/files/lefimuxudaxepexunegiloj.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611b61bbf0a8c---5641478064.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_off0000c94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94A 11308 bytes
SHA-256: 5e01d5f3433e4b0a36a8634f39912b0209ff37fbc175c8125a82051451aea83d
font_01_sfnt_off0000e371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE371 17424 bytes
SHA-256: ef6635cf8cb96e5fba4963475949af51fc08a51c530d8562e6418425d9a3bb3a
font_02_sfnt_off00011098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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