Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c16774f2b66c4c…

MALICIOUS

PDF

86.1 KB Created: 2021-07-13 20:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e2a6eff50d4c02a6f1392dc3b3cb6fe SHA-1: 3c96b1210e7539d5b75677db822d3a1b4ca5a6ae SHA-256: f5c16774f2b66c4c7b60407cab63a4d2d4c2fd9ab66c42f3daa170cfa86059e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://irlanc.ru/uplcv?utm_term=skateparks+with+lights+near+me
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/cior6ldjf8r9qgrh707qheln6s/juferaganujevew.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/d0ce32d8e4ffe28ee61a7fb00d698445/gadobalesizeguvote.pdf
    • http://kamerton.nl/clientfiles/jatixukoketudufulonak.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/a7045e8a91e0b7cd0d89519139d8d270/41372550980.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/tn61s79m9ebithpllv00dk6h58/4920002801.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/abd5a201fbcb8a28a4b372b817d2041b/52286972009.pdf
    • http://bawaconstructions.com/editorData/file/97790735896.pdf
    • http://deccanquest.com/konadnew/userfiles/file/2752796884.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/c3bba3502dd66d54f628ad256cfb4091/nazore.pdf
    • http://blissworldbeauty.com/newerac2c/userfiles/file/53819237908.pdf
    • https://boyanbolyarski.com/userfiles/file/17544310542.pdf
    • http://artecgroupservices.com/imagenes/file/xezudizovizajibatanasiniw.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/np6d3dnglf3ui6st0jsh7gqovj/44148875467.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/9551e916d8a787d38f62b76f4dc271ee/rugukesasusobezusudizobu.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/ab134fb8344569b7b4302565eaa24a25/98178263444.pdf
    • https://guijek.com/userfiles/file/14565148067.pdf
    • http://summithighschool1958.com/clients/71652/File/minidawomevajivogaj.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/1d71a0e9c7160286da787a5f33db009c/leramonijoxilin.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096392067e59---bupovurodub.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b866f321633---54819238109.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/78e942f85b4a94b0425528e52ae976c3/14619785000.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160da795818133---56207100692.pdf
    • https://siahotel.com/userfiles/files/ralavobewifakinoje.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078707333732---dinuxibomuj.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb4d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4D 16792 bytes
font_01_sfnt_off00010364.bin
3c3f54b18efab7585b72c124b9921666b11f2743159cb9f86e091143c2993a8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10364 10832 bytes
font_02_sfnt_off00011c3b.bin
0ede7ffe2261f326e6a941eb66bcd1f78781396a353b090e99b7fbab5042e4a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3B 17324 bytes