Malicious PDF — malware analysis report

Static analysis result for SHA-256 4305379d3260add6…

MALICIOUS

PDF

78.1 KB Created: 2021-09-02 06:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7636533416f55a98984fa9bc7b063af8 SHA-1: da217ad48d96c9512fb85a0495512cd36e8b7be6 SHA-256: 4305379d3260add695aec00a2c214869fafb47ebcc04a6a637057fcfb9420b22
164 Risk Score

Malware Insights

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

The sample is a malicious PDF detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript, which is likely used to exploit vulnerabilities or redirect the user to malicious URLs. The PDF also functions as a link farm, pointing to numerous PDF files hosted on various domains, many of which appear to be compromised or disposable, suggesting an attempt to distribute further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/04e2bb0dd349a7dde022570a60d4bd80/98975790155.pdf In PDF document text
    • http://regalmotors-jp.com/js/upload/files/potifubomaferibiziwetoli.pdfIn PDF document text
    • https://soechi.com/userfiles/file/35091017288.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/zujajosixotojoteg.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210808113359.pdfIn PDF document text
    • http://muszempilla.com/files/file/nezufamolipirukesab.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0136b65731---30691676411.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210515030429.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/444j5co73s2ebe0jf128ldsbfd/11687449813.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/48690469732.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11621302095.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/bamukix.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdab7cbaaa---sogezunaziruvopi.pdfIn PDF document text
    • https://digireg.dk/upload/zunulosojagogegu.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9fae25598---80810573116.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/675f82447d297af67eebed337449b4b9/bilopumetunewidol.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/e6b7e25cf696b5890d2bf912fab60066/wosudoromanitalotowike.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a349cfa421f---79418886914.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/zevam.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf97b8e13a---37539284619.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/61688198967.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/notexasiperobuleg.pdfIn PDF document text
    • https://susta.vn/userfiles/file/69457913086.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6afac8e27f---5473708651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=model+agency+contract+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_off0000cfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEC 16432 bytes
SHA-256: 2dede791782b45b47f1858c47342d39deae08684838de76963b66d125c744c9e
font_01_sfnt_off0000fa30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11247 10644 bytes
SHA-256: c778c5ee8b3021b38056db769e4c3e15c99d7f438fbb308b1f324f1e96b89b0f

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