Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa50c8f8ecb9aa3…

MALICIOUS

PDF

92.9 KB Created: 2021-09-10 06:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b557062d5c2d9de50787426c5cec0c5 SHA-1: 7a3a083e299eac87810192560c3330dfcd68626c SHA-256: caa50c8f8ecb9aa3b4788002dff5d95849573a011d91b9f0fe6753b272a512b2
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting. The ClamAV heuristic specifically identifies this as a 'Pdf.Phishing.Trojan', indicating a malicious intent to lure users to potentially harmful sites. The presence of a link farm suggests an attempt to manipulate search engine rankings or distribute malicious content through various compromised domains.

Machine Learning

  • Nyx PDF Classifier clean score 0.1561

Heuristics 5

  • 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
  • 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://telorgabus.com/contents/files/33091249890.pdf In PDF document text
    • http://wefocusdesign.com/upload/files/narewuj.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0df7c71e9---83867985739.pdfIn PDF document text
    • https://onlinendttraining.com/files/57543158199.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/22499235241.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135135e2633b---42112812320.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131864ca140b---54353874849.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/kubugikideroguku.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/lamamuvejitusikop.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/1905745392.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/32715011956.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/58058379518.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/3f03aab23677e65ba357f08265c2ee1e/luxedekegerupebobeli.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/70142634469.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/13983032782.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/katenir.pdfIn PDF document text
    • https://vleek.com/uploads/files/43049239416.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/denodufisusopuvidajev.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ab1a182e---86163901200.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f95bf6f212---14757717238.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/93071720580.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109071925028080.pdfIn PDF document text
    • http://knipia.com/userfiles/file/janexewew.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16134cb1e07a1f---46792642114.pdfIn PDF document text
    • http://ihdbd.org/upload/files/baragapopaxi.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/51512067233.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/68819243052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=team+sonic+racing+mobile+apkPDF link annotation
    • 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_off0001136b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136B 19572 bytes
SHA-256: cd143d667b2c2d5484a9748d4236b8bd35baab2a6edbed5bcebc5501a7e22a96
font_01_sfnt_off00014636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E4D 10812 bytes
SHA-256: dbc763bd3d5732ebd8b4c9a3ea6a04dee1379e47c3939d03596087d46e7fa9f4