Malicious PDF — malware analysis report

Static analysis result for SHA-256 066873b7474b983f…

MALICIOUS

PDF

86.4 KB Created: 2021-09-01 11:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ceff728c1ab38131a40c9471615a7142 SHA-1: cf79afc766adb31c1366336cb62b792ee24d46b0 SHA-256: 066873b7474b983f70976fd31d6d2b6586efa23a8236e6c4ce58be45cab38295
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, directing users to numerous external URLs, many hosted on potentially compromised or disposable domains. The primary goal appears to be directing users to malicious content or phishing sites, leveraging a deceptive link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ratsimae.eemedia/contents/file/fafoxifilezofujuduk.pdf In PDF document text
    • https://transport-vehicules.fr/userfiles/file/lomuni.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079485a6274c---zatesaridifojazuvin.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/f7ec9fa4f9019e566a480760a12f6bde/gonidajerenafox.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/tajugek.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/71421375742.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/18637642997.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607de45515235---69880289536.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/07911ef3a3b782171ac145f76de11e50/gamilegizuwupaweridiro.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/1eedad6e73318d79d01726bc3bd7b7cc/59623147868.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210725081150_xps96d.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/2d15520c91f575b2d0c39d1ed2329d1d/sufomoner.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b00c30f0ba---mexudeloxitodisuzanagu.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9669b38742---birimemalapam.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/kapufizadedemev.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/78384359641.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/2562ed2c533732e253b79fcb8fd41b94/60323887433.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/rosuxo.pdfIn PDF document text
    • http://rilta.net/userfiles/files/zukosun.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/18998524314.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0f4d65d95---57229427827.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/22256077461.pdfIn PDF document text
    • http://ducnhua.com/upload/files/rinubonibigipafagakeza.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9759417dc1---98723162531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=satan+and+the+fallen+angelsPDF 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_off0000eb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3A 10396 bytes
SHA-256: d0f2dd30b27afd870117a5fec06584a98fa334b26be7c3098a7ed2803868fa26
font_01_sfnt_off00010273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10273 18460 bytes
SHA-256: f98d35200ea51607173160b0f6816e86b140941da4496f5ec5120210c492373f
font_02_sfnt_off000132db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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