Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb86f4f96bfc7ca…

MALICIOUS

PDF

75.3 KB Created: 2021-09-02 07:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a306bcbf7082b544de103bd13d37bc45 SHA-1: 8f6b8c95198a9a8e80b3aeafb6dc4460578180c2 SHA-256: 3bb86f4f96bfc7ca1c5219ce0ba719ae81e4083c5060afa636a98de3b5a0eec1
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to distribute malware or engage in phishing. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://akifkasaboglu.com/esatfisek/images_upload/files/75897081768.pdf In PDF document text
    • http://blessingsngo.in/userfiles/files/97559543825.pdfIn PDF document text
    • https://leavingcare3plus.ch/userfiles/files/megapidoledokigigopuxam.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a222066095---7557754139.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16082df6237a50---xudim.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b806a7b311d---68990950042.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/gafutotiwoxisalezatufavon.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/27993737198.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/rikazejobufibo.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/m0oa12tstrtu7jrjvl04g25j4a/nezojetufaveg.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e82d663616---bamakodafowazosev.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/1ee3fd482e0961d7b7d1ee562d765970/lajuxugif.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/nivebebozewabifapub.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608029cbd203f---76758569982.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/70721782232.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/32513483859.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/povagose.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/jd2m6c5hl7s40dvktieupfu08t/figulod.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/61041766832.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ff467d30396---gajobifudiduluma.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bd0e6ec7f---66893423540.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/66264639572.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/wibapanajidudotelixewebu.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/52b80f4236cda9281427d63c38467b94/tikapiwixevebomotixoves.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b338f6c5b47---bakotakuzavojo.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/nifujodadoxoxugur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=substring+c%23+onlinePDF 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_off0000bed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED4 10260 bytes
SHA-256: 26daa4d770e757fc20266036e00c49edbffa418a194a81fbd2701ca20c9a7ba2
font_01_sfnt_off0000d5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FA 18612 bytes
SHA-256: 0bf6797eea26a1eb121c712ba3c4a889c2c9be7df8f4984d182be74fdef6591d
font_02_sfnt_off00010653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10653 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.