Malicious PDF — malware analysis report

Static analysis result for SHA-256 a327bffb94771ba0…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 22:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ca8b40450b4a5815b130ed8250330699 SHA-1: d320a09e8de0c59ca1aa86c47ee3607fde45f681 SHA-256: a327bffb94771ba0b99bd5f0271fa8f718d7d34adaf0efc7661c3239783f55d0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://www.satunatc.ac.th/ckfinder/userfiles/files/vuvaguweletowunetamafokol.pdf In PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/pr42b3rtdkjffoptgt0sd92es2/98893686467.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/71526505471.pdfIn PDF document text
    • http://drironcat.com/images/file/18455425421.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210921_143733.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/sukozugajofasew.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/40379938547.pdfIn PDF document text
    • http://organizeteknik.com/userfiles/file/lokumokopuj.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/22572994746.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/nonusijivufolapewimup.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/47281129288.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614e82624ee11---lojof.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/96627595773.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc0ae6e325---losiker.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/lewutezijiva.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/14804911498.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210909_053C353FA1685ADB.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/vubixuwevog.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/94444872107.pdfIn PDF document text
    • https://congchung7.vn/upload/file/54887031504.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109191813331431.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109020209365633.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/gufunolenap.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/74536200202.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/wawijiz.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/wemowozajakitefedatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=redmi+note+9+internet+settingsPDF 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_off0000b2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B4 10596 bytes
SHA-256: 38d9115a3d93138e31b19f3fcfb548ad27239b5b8fde536c42c31c401e201e7e
font_01_sfnt_off0000cab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB4 15844 bytes
SHA-256: 3912816611157a9c1c2cfb7ab485b28590dbd924f1df78f2bff9ea29c8781488
font_02_sfnt_off0000f324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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