Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a244a781f6ccb5…

MALICIOUS

PDF

75.3 KB Created: 2021-09-01 05:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d5333efa13ec3d8094a5a1f38d14d66a SHA-1: db00382347fc2c7fcab457e23b5f8b6cdcf48427 SHA-256: d1a244a781f6ccb580eb65119e655d94a7ff15a39ec375c3b0cb3950813ca288
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 websites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings clearly point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/d2a93ccc95ab0c6d1957558ad9b2960b/vadenutaxudos.pdf In PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/32046096918.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/49662082914.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/3983598331.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bc21f3864---83716743028.pdfIn PDF document text
    • https://badrivishal.com/media/35049729241.pdfIn PDF document text
    • http://recviem.ru/img/upload/dujobumagux.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/zoxenozozamu.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/990f43cb95ba1fd2a1388d8c56a58a11/36941303041.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/32111519931.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/57392632279.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b3cda18e59789a30a238f3777a68b629/87854649610.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/14607923535.pdfIn PDF document text
    • http://charivne.info/images/file/mazipejufovopexuleza.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/virobixanojikedofejubi.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/peduxones.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/65476118224.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/a16ba5fc0d775843271b5af06a468653/wukagikepejupa.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612aaea657187---40958840893.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210825214639_to8lya.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/20998429137.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c49c30be28---mamoxopotidukuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=shared+parenting+planPDF 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_off0000c764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7B 10460 bytes
SHA-256: f968593b27c2ee00fd758975a59adca277942531ee8e35fec0b15767bbe47963
font_02_sfnt_off0000f6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E5 16128 bytes
SHA-256: 6d8de04739a5ca6310c7b33c684430942d8348bf49206e047827f79be3a70335

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