Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fdb25c1e1bd1e9a…

MALICIOUS

PDF

86.6 KB Created: 2021-06-30 14:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 360dd97ce148513b1d9bf237444a67ff SHA-1: 0cc8fba5d0d48a7df0280c57524c9bee4779e4b6 SHA-256: 5fdb25c1e1bd1e9a959c3bf1d90ed194e2e82d244e09ba274a8f462bfc951dc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO manipulation or to distribute further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://medvor.ru/uplcv?utm_term=red+itchy+peeling+skin+on+face
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7384283265---mexukemojotaxuzuj.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/240b995c79dd1fbc98e386cf69becdff/zupefitewomeboxupitis.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1b184a44b---57515180408.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/kaxoluxezom.pdf
    • http://www.agenbenangbandung.net/file/80830419507.pdf
    • http://tvkinter.com/file_media/file_image/file/letetariwuzopobisinite.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab850adf292---91517187904.pdf
    • https://creativitagh.com/pevron/www/img/file/dapujuzixizokorara.pdf
    • https://szabobuszrendeles.hu/files/files/nujuzavep.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3cd6368be663fbc324e801bc4479e5af/nerul.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/06f1f2282f0d29e05d68914b870a8225/49455833622.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e888959b8---tevawofu.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/d86e54c188e195cda8ac3c9145a168a1/25998953529.pdf
    • http://www.aluvascientific.com/UserFiles/file/lupujisevabidewut.pdf
    • https://childconcern.in/trila/userfiles/file/9331528797.pdf
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lesemiwinexodezuzabib.pdf
    • http://air-ned.com/uploads/files/vogobogakafiwona.pdf
    • https://peterdegendt.be/file/diwuzeterog.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f9aba1d1a---noliwovafopoferuvixu.pdf
    • http://prosquash.by/data/42560358606.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/ggqu2pratknpaohb62oh2dpojm/zufutadimavefuxuv.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4459eb244f---3227012385.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9890a9680---32926036972.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_off0000ef6c.bin
420b4b26e48f825b3c7defe630fa1bda1b74a4e29138aac2583f649a4ea42b60
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6C 16404 bytes
font_01_sfnt_off000119e3.bin
629750f8a4a3b42b6fdd78b789e3d7c7c0dc205049f1e0e0544b30f19c4f6e7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x119E3 11048 bytes
font_02_sfnt_off00013361.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13361 16792 bytes