Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b637d0ec08d12af…

MALICIOUS

PDF

112.9 KB Created: 2021-07-17 19:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d0195aa1a082ed474efee6f79c9ddc6e SHA-1: 12286aa8d59de854778ecb786c8403cffe947824 SHA-256: 9b637d0ec08d12afc83cb0ab40d4926e16a3480aa3db3295eb6e3babfa7f0aa9
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm on compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to malicious sites. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8471243494---36668648913.pdf In PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/7eblot36se4cp6r8gffaqjdu41/70873816003.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e15f34ccd474c924c913f52a9daa0aec/30866664771.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/38860071616.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608a63fea1f8f---joxajeriduzoxibo.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/68728160885.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707db9b0735---rilolobedogoxaligujesim.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087659f72b0f---rorosokaxixisetotabufumot.pdfIn PDF document text
    • https://egf.tw/test2/images/file/45531818678.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/ods864pejr31oadem62jupmfnt/50367342345.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160940cb69031e---notibu.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/72347e02d17f2676d9d94bdff2261ad5/16154684661.pdfIn PDF document text
    • https://summit-christian-academy.com/scauserfiles/files/pigumatojefapadubexunek.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/o4luvu3hsrkc6o7av6r90j7gp7/burajusowifututor.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/bmp6rv1fsu4hkskbnh197ij333/56915604275.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608134a516ede---jasegisaduseva.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/15225636878.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/53309674018.pdfIn PDF document text
    • http://bowlinggreenhsclassof66.com/clients/b/bd/bdf8ab256cd88a603fc2b95a051c5839/File/wipegixowavafekewagofig.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099d5978e4da---fagigesufitisapolopiw.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/eljf5o78ahrdnv3732hm4qro77/fesuzekadumudasinob.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/1507649575.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/83102147274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=educational+review+manual+in+infectious+diseasePDF 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_off00015881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15881 17076 bytes
SHA-256: fe82ee744461831bc64ad90949cdbde61553e3cc091279a8e8d57ebe016863cf
font_01_sfnt_off00018513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D2A 10872 bytes
SHA-256: 34b47880938281735b7cbb8cd55c705e8ef1e4720367af4bf302d63502f7bac9

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