Malicious PDF — malware analysis report

Static analysis result for SHA-256 293f585fd5baaef5…

MALICIOUS

PDF

91.1 KB Created: 2021-07-25 12:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 54b20f64614d11d29428aa8f18589ab7 SHA-1: 29068c92df70c8bcb0f60d49d460d09411631617 SHA-256: 293f585fd5baaef5bf0028d204c87ccbd70acdec2e2bae007d37c27444d4db85
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings confirm the nature of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://hykylalumni.org/userfiles/60838012139.pdf In PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071364fecffe---wenojamodutunibuduvaxibox.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/b0a03212acf4762c79f1c4f884337f9b/17630427127.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b240e7c41f4d0eec7b7f97a1e34a3fba/rigul.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/fevuwoj.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9dfc71ab5---95374103152.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/5fde9e3633560f3d1ef314190b690333/68073486002.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bbff0330457---78274748371.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/258a7ef3b600fc6bd94e23fdeadc73e2/45159520900.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/befafuwobikavadipevexo.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/2593191660.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/digemedon.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/74822288164.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/widurodenusujomebipeva.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee2f88e2a0---43295124355.pdfIn PDF document text
    • http://healthywithhart.com/res/file/mubovuwixiba.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/42349383108.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/f9f00d280c56b016dd5189bade2e1175/60884519486.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44685bdd54---55224345511.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b641f7c75b8---40869058978.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/jodosotove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=5+kalma+in+englishPDF 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
stream_005_off00013a51.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13A51 20988 bytes
SHA-256: 6ada9e4c7b1994ba47658a2f256b8304ef49bf01cc107b70573271027cc8005a
font_00_sfnt_off0000dcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFE 10364 bytes
SHA-256: 7862ea548863038b94ed278c58e105a01373236d68b92f2dcfb77541dba4536d
font_01_sfnt_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 17636 bytes
SHA-256: 8ad6a70ccd73685f0f1d95c981377aa8ff6e65bfbf922d4e4c8b719d61507442
font_02_sfnt_off00012240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12240 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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