Malicious PDF — malware analysis report

Static analysis result for SHA-256 6610fd4146158301…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 11:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5556646a56064a9dfe7341baa7a4e278 SHA-1: 417e21e62cf84c76f5392fa1c64d37ebc1825acf SHA-256: 6610fd41461583012968effc9fbf376e263984354ce66b76f72cf81868afc9be
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malware or redirect users to phishing pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • 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.
  • 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 http://cuathepvangohaiduong.com/images/ckeditor/files/xowigutit.pdf In PDF document text
    • http://autoklej.pl/app/webroot/media/files/93185024820.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/6803045253.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/88414532501.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/zirumipuzuwo.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/74009806847.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/3860144075.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/jerizamupuwumeletedivudom.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/61866341447.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c62b50d01e---93691370458.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/rubimuxeduzumize.pdfIn PDF document text
    • http://grimastone.ru/files/99462063349.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/84520765416.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161327be8e7d04---7452751761.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/31754567582.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/15535510076.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/wusuwibepusev.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/rejasoxajedonutito.pdfIn PDF document text
    • http://teresachild.com/upload/files/digajusul.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/puwoxaw.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/15624844123.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/306574ebf301e986168dc5b2c91f6315/muzufumewuvoduwovitiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=pokemon+tower+defense+4+hackedPDF 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_off0000d4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D8 10860 bytes
SHA-256: 6b53922a3d50c1c327e9385d4db8b2783d9eb42db3e86d6db8fb0ea2c25c2625
font_01_sfnt_off0000edeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEB 19412 bytes
SHA-256: ee00d8c87edb567f0f4797b57005c762dadfda120fd5564616c89c640fa7f9e0
font_02_sfnt_off00012129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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