Malicious PDF — malware analysis report

Static analysis result for SHA-256 d11b14e5a8f3e41a…

MALICIOUS

PDF

68.9 KB Created: 2021-09-06 02:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4359e85920ed7ea7a4924eadf73dd575 SHA-1: 9695c4143e49520a6b675531634b9d548e51fcd8 SHA-256: d11b14e5a8f3e41ac9d3ef5dfa2c90066710c5debe7311c11d3bf144f7a7c746
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains an image designed to obscure clickable links, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The presence of these links suggests an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://twinslock.com/ckfinder/userfiles/files/82262448414.pdf In PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/ic9k8k92vk3125687iq625180v/tifedud.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161257a7b2ed85---vewaxipedivafuzadaketaxex.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/61994462546.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/d6d952b942a8a023d525995ccb4429fe/97715331562.pdfIn PDF document text
    • http://ave-france.com/pics/files/zupugojajasexesolosiperom.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/b1120c991dc98b62868c473818f6785a/mopuvotagiwud.pdfIn PDF document text
    • http://baobiachau.com/luutru/files/73359951549.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d061640e2d2---54228561425.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/45563185881.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/tukipifufakadug.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-8-22/20210822074737703353.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1626383988juwirizitilelaneresakan.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/devekodugemojaxozo.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5e54fc0b5b9d9c700f3f3b5c496e26b3/kuwipel.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/29d3t3fu33gg5akfe28knksj3n/26315825223.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/81702622926.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b936694fa0f---60828968751.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/dowerevowofefafobu.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/patuveku.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/86628952621.pdfIn PDF document text
    • http://vandofigueiredo.com/userfiles/file///baxatoxetikixajuxupow.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/fusefipoxubawotujurarexos.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5944814e7f---7045952554.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/43702821430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=cyberpower+1500+manualPDF 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_off0000b097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB097 10836 bytes
SHA-256: 2fc4e1069b206c784652b6b41543bfbab3ec37b5abef33f1f6b7bd29bc5186cc
font_01_sfnt_off0000c976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC976 14216 bytes
SHA-256: e71eba5143600a6546aba05f4bf2752208064c352cebe1a5c4a5f788539f6002
font_02_sfnt_off0000ec9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1