Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb7cef042c85203…

MALICIOUS

PDF

80.8 KB Created: 2021-09-22 13:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 46b13eef13860eaea5cbc15725dbd129 SHA-1: a0e803c43795bdb07c0a38585a43f56f486edc92 SHA-256: 0cb7cef042c852030690b1eda48accc3148e893c0defacea78281f89993ab66d
212 Risk Score

Malware Insights

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

The PDF file contains a fake CAPTCHA lure, designed to trick users into clicking a link to download a payload. Several heuristics indicate the presence of link farms and compromised CMS uploads, suggesting a distribution mechanism for malicious files. The ML classifier strongly flagged this PDF as malicious, and ClamAV also detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd15766c75---ruxakamafupuxapedusaru.pdf In PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/o7pe644o3rn51o0jk1q6qfnns0/refefovarese.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/29f6f14750eb1f0bb7b2adab19fd3d57/12178841210.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/89808671442.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/kolajiz.pdfIn PDF document text
    • https://creativetalentnetwork.com/ckfinder/userfiles/files/74578281625.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210905_A8C8C519944A3224.pdfIn PDF document text
    • https://cathita.vn/upload/files/xixerudo.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/21994349258.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/51336756562.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/papumagof.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/tasesesokoxexivi.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/93071883171.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/66a2e84d650937191aa12d3d4fa9eb36/fosuxanaxeg.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/061816331978.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/kuzewomajoregejo.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/328465782.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/giwivozu.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/mikowuvurubarafukiji.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/93578610464.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/4845166469.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/lokikusononurajonenew.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/dezusogosijagijasepido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=human+verification+apk+downloadPDF 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_off0000d3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCD 10948 bytes
SHA-256: a2af3023d854b1fefc163121c945b3c5fcd2bda51d5cdd64e6090392b9e17755
font_02_sfnt_off00010523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10523 18652 bytes
SHA-256: bee977c96eedffb2f3084e9e16c802c813c4808bcfb791b3593ee60009186b1a

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