Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5dea3ddc1e107c…

MALICIOUS

PDF

87.7 KB Created: 2021-08-12 03:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2a4e0b4c7fca9f8c0359e988483342c8 SHA-1: 2804d9f3158f8977a94060fcd2d85b06a8f98e2b SHA-256: 0f5dea3ddc1e107c44430c3c556b0f6b2bafbbd2f94711f2c3ec5fb15d5926fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, which likely serve malicious content. The presence of numerous PDF link farm heuristics and the detection of a 'Pdf.Phishing.Trojan' by ClamAV strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://santeh.md/img/files/wudox.pdf In PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093e475a0b98---lofapodijarurur.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/77765666526.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/pafexamadiberiw.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec23759ea6---pujopunuvapewizunut.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d5764f933---51199966147.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210527_6B90D1B4FBDBCBF4.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210610072644.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/tudog.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/51182586785.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7a7f77ab74a43cf801117d169bda5721/zibivezepaxelegupujezov.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/78548156268.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/70422867886.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/maxewus.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160837c88c88c5---waburusatidol.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/37ae51267f17c8d4df20cebbc0ab9a54/beninotitemomaxibivupa.pdfIn PDF document text
    • http://beta-rc.com/upload/files/zafetowibax.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/56609610923.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/61825487144.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202154658485785.pdfIn PDF document text
    • https://mvservice.it/file/84272671299.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/1472692012.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/73018455314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+use+weider+ultimate+body+worksPDF 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_off0000f2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AA 17264 bytes
SHA-256: ff6ed494b285a198e5052a93dbe353c11529092137987c0be4665b19d56e6994
font_01_sfnt_off00011ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001380b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380B 10828 bytes
SHA-256: 788944ce7c12088f1fbb5ed4dd0470f01bb50ae9c67529349b747a77731e7114

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