Malicious PDF — malware analysis report

Static analysis result for SHA-256 359eda3a3f851843…

MALICIOUS

PDF

78.0 KB Created: 2021-09-04 13:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e728bb7b1ef7ba9a17c2d5ce19b75c95 SHA-1: 35d0e345301922e2d347a05ce5744c0e072db9c7 SHA-256: 359eda3a3f851843e7ef289d5aefcd92b2b73e5665314ebf3d71fd368b770e3a
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised or disposable domains, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly support this assessment. The embedded JavaScript likely facilitates the malicious redirection or exploit execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://toyotarent.kr/FileData/ckfinder/files/20210624_7735B4D60CB080D6.pdf In PDF document text
    • http://udmvdpo.ru/images/files/25187767843.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/s37120en16m63fato8rhiu1fov/dumejevematub.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/eed2c463a1c9c7e1d73dbe4c5e183708/sogajufutozedaxopeda.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/60977213739.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/4e862373818537fb7f12215d817eef42/guvalokarulujutafeleda.pdfIn PDF document text
    • https://kimcert.org/E/file/bazupipesaxujivo.pdfIn PDF document text
    • https://designclarf.it/file/jitekutitenupikofazope.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/80531613406.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160bc65a5acf5b---fegekasofakekixamo.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/48463187584.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/40354939381.pdfIn PDF document text
    • https://southafricapools.com/contents/files/87751742007.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/eecfb9b9dc46b0f559c8f4db8f7ce2ab/zeruzovik.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/26770064243.pdfIn PDF document text
    • https://sanagustin.cl/files/26784334943.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/25659732679.pdfIn PDF document text
    • http://chikatere.com/Upload/files/22858958510.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/90261145125.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad09794a7da---36661216482.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/getepajat.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/6968534726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=qualys+vulnerability+management+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_off0000cb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB67 11200 bytes
SHA-256: df4a2b9e54c88566aa6ddf376a0245a201c49616da69bd82712c125adfb1acdd
font_01_sfnt_off0000e553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE553 17292 bytes
SHA-256: 25238b33879dc4d363ae883a40c44a2b87cb5d7ed7cf8a072d666077b76cab51
font_02_sfnt_off00011260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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