Malicious PDF — malware analysis report

Static analysis result for SHA-256 125a238d42a23140…

MALICIOUS

PDF

78.1 KB Created: 2021-09-07 17:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d24a9ca084b6bad7ea4a5dd4e99c2333 SHA-1: a652a4a9a881da9ee16a897823764da16fc10e1c SHA-256: 125a238d42a2314064edc8fe29a5a3bc019fc8edf832911d3d130a7f563fe9ba
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/dogegamenexujis.pdf In PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/5fi1hfct3q376orke32elksvtp/wizovatawadibon.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/82137714154.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/bibemobidil.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cef7c5bbf826544c943163965d5343a0/92862266045.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/62514543542.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/nosutefenimowolax.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/81db4fc877d0cc63fb24c04e1a3099a8/gimerukedixodesafi.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/kogagilokago.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86754998818.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/55845985163.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/nemowi.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/wixipezebonazukininidafa.pdfIn PDF document text
    • https://rinducm1.com/contents//files/pezitabizonosubo.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f03d42bccd9---palozujivamazoki.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/31691501007.pdfIn PDF document text
    • https://medpressa.ru/files/file/buxovawowipek.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/nurobasiranifave.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093f8922a1ec---wesif.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/momixofisuzujidifegam.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/64630062285.pdfIn PDF document text
    • http://kotolantopeni.cz/file/lowimiduratamisaroboke.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/66968856190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=anemia+hemolitica+inmunomediada+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64E 10696 bytes
SHA-256: a3d09cae95d4d00aa6f94b8fa14388541408c3ed98bcfdc0b2e5fd7d9c3b301f
font_02_sfnt_off0000fea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA0 17180 bytes
SHA-256: 6070ef4887ed857f3fc4a6727090274b476e48ee594f5e688ba453522614d029