Malicious PDF — malware analysis report

Static analysis result for SHA-256 7626f6b0ef0209a8…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 18:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7d607bea0c247672bf539f937e50d2a7 SHA-1: 863bfa2d2c2065d46838ea43181a6317361e90ce SHA-256: 7626f6b0ef0209a8cfc22e82680174f0af54ae90d3be0408d40a4c2d7c31b901
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/41556f5a815f036059bf16f33c72aa8a/9542536173.pdf In PDF document text
    • https://mmagame.com/userfiles/file/bodunata.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607764084d44d---90195701447.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/95134571381.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968007beae7---jozesixetumesulitulopu.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1d2d58c47---samezatidoji.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/linakirakifodexomakomiva.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16115c07e395dd---loferedej.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070024a340a1---58899849737.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/eb8178e641573b63b4ec9c6f32a64d6e/98080644827.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/gujejikovorut.pdfIn PDF document text
    • http://dzbnf.com/upload/file///26921879.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/76851742133.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/fudasasigepogo.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f47d50e9e---89807879077.pdfIn PDF document text
    • http://iwort.de/userfiles/file/48448012117.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/72192598999.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/gopofamuvafisozimufado.pdfIn PDF document text
    • https://jss-moms.si/upload/File/jodekolasus.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/900d258630fd2fb2f2e43f6800e53d79/munarolokifemasosewofor.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/57255074406.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b5aa41927---pabujavavarulivusiwufege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=abstand+punkt+gerade+aufgaben+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c60b453fb744e4b4e23404315972884b/22378868369.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_off0000d3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF1 19064 bytes
SHA-256: a427258b156af0b5aa8bc5dc43febdadf075bde3d7e8eff53e4943c1bb00251f
font_02_sfnt_off00011c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C86 10728 bytes
SHA-256: 91747ee6e46bfcbe6bf14b69f081ac9fb83b4f455768572a5e64429f65d69e3c

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