Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e3ae4d07462d4e…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 10:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0bed24ab291f563f64791fcb88818b9f SHA-1: 904c6953036eecbe72f1837e5e33f186040cac32 SHA-256: 91e3ae4d07462d4e98612a311c78f982b9e3f5e5563e4fe503d2c4f16aa9412b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document is identified as malicious by ClamAV and a machine learning classifier. It functions as a phishing lure, presenting a screenshot to entice users to click on embedded links. The document contains a link farm pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 70 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://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b8066103f---42186812717.pdf In PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/46460781306.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/gowikaseposesukikegule.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/8259893922.pdfIn PDF document text
    • http://boldogelet.hu/media/netojemewip.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/81991606424.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/3an6qs3th5mo4lsjjp4ga5go2m/33093018087.pdfIn PDF document text
    • http://davobio.com/upload/files/ritefegipuzozipenitamu.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/54666523772.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/sotamisidenutilijiseler.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134db0b73083---60927972295.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/o24kaqdh101legn64jvm55c05c/50052092784.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/e7adf69eb415e4707f46016902f6a9e2/kozari.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/pelofobozipezimixalu.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/sozugolupol.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/fisanir.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/cef75e02b8c0eae6f8951fd3a018156e/17775186477.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/d1oibf05qvvfvjdp0qk0egaljp/19289749545.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/91991200670.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/tofilizijomonerazo.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/99829306970.pdfIn PDF document text
    • http://langmypham.com/luutru/files/13582995838.pdfIn PDF document text
    • https://forumsevens.com/images/file/wezakobakisutunilelen.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/pebubijitamulasegebo.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210908165523.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/ranozovipasadog.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/75049222493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+connect+mac+to+android+hotspotPDF 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_off0000b6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FC 10808 bytes
SHA-256: e03ae9080d177ab9a17746a46a9fcaa44a6ddf9df2cd415aa9340f348f9a2ff8
font_01_sfnt_off0000cfb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C5 14532 bytes
SHA-256: d2e8ef9299fc6a3521f9043a3f7fa7a8d3b758e7086d4623d4d59e7f86fcedbc