Malicious PDF — malware analysis report

Static analysis result for SHA-256 9afc52f7522db5ae…

MALICIOUS

PDF

73.9 KB Created: 2021-09-04 15:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: a57cb75dd5cc823d3e97eff1366be6ee SHA-1: 6677a3ab397ec2e2bfebe49f1ed30f4ceff4d9d9 SHA-256: 9afc52f7522db5ae864ed878c3ce7cda69b0e5996a9247324ed588878090dafa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=guia+para+aprender+ingles+desde+cero+pdf PDF link annotation
    • http://vladjurnalist.ru/archive/file/4966124920.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/27175419332.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/78240757115.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/47331033083.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/tumoxawunaluwef.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/muguzikaripirimimesadapi.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160870b42ad4c4---gupojirapikaza.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/wobimene.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/beriboxijisu.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/vasogikuz.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/46905316643.pdfIn PDF document text
    • https://eclearusa.com/images/file/87720147230.pdfIn PDF document text
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/14632663210.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/30c50e582d2bb8ce5916d93b5b5e20c5/dodiva.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/35865707033.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b021efd5d---38054938457.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae637de6031---mibolarug.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/95702585110.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982be517aa4---sumujepolakak.pdfIn PDF document text
    • https://ijpdua.com/contents//files/kebuzodimapatuse.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/manubawe.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/1bf6b3d1d1363f40996e9349d987ffee/verat.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D5 18368 bytes
SHA-256: 523a9c2861fd1a3a6ac3491b050dcf5ad9c0c7814f551b2ec0e0e48acc24e43a
font_01_sfnt_off0000e7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AD 10836 bytes
SHA-256: 17d48d1f52a5f7e610abab34de96e4503bc61b113382297469b2972f76ff1a48
font_02_sfnt_off00010090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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