Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5950343561a4d19…

MALICIOUS

PDF

84.3 KB Created: 2021-09-08 01:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8b3f90f4f0cd6aeb9aa1617e0ec65f8c SHA-1: 27e3dcc1a5c3fe5d4d4bdf3db32f306234182c11 SHA-256: c5950343561a4d19216945a7abd01215d7daa9d426682cf801e1bd7f4b7fbded
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • 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 http://sieuthimaynhapkhau.com/upload/files/10282029597.pdf In PDF document text
    • http://zetrade.cz/userfiles/file/roveluguwetovubotazebe.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c29dd336fe5---nerevadufiben.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f70d997c5dc---65241013823.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/rudibizomawa.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/simojizosemuradonizubesim.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/juxewisekumi.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/rutupedebogonalise.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f5463278b3---23377177920.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/e958e648ad6c0e8663a68a47e3145d1b/kuwesapaxu.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/labonazapumavuzex.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160768f911fa86---31663291231.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/rulalamalaneka.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e870517cfbd---fubowulev.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/r3ii07vkfncpljaqhatutimd1l/9643744831.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/dafc0a590eb8df6dfe6b04085bbc2f96/9580045659.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd18a666f2---sukase.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/45190573457.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/567605865.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e89d73a514---lepiw.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/79ea63b29e30c074d9340803e179bf3e/pexinebopivonokabax.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091b917965aa---38214657982.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=public+policy+evaluation+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_off0000e415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE415 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2C 10768 bytes
SHA-256: ba629542183434092736055ca5eb5d5af07390a3488a3f018728354c969b2264
font_02_sfnt_off000114dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DD 18248 bytes
SHA-256: b5556f66652c37d3f322196455e18f55ea7f825184ff79f47f491042efe92e5a

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