Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5653417e7fefa55…

MALICIOUS

PDF

73.8 KB Created: 2021-09-03 02:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4d480f4b4af02766d9fe072c70d9f721 SHA-1: 6f310a61b4be51f8d987554027dbe60c4220dd5c SHA-256: d5653417e7fefa5597dd001a00b95d3f7d33fb38b8d3ae3bc7d57a5054410d6d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • 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://pistant.ru/uplcv?utm_term=union+budget+highlights+2019+20+pdf PDF link annotation
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/84ccf3df86bc77a0c712ef7f450fe517/dijijoxemusesinato.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/sopopatixilateziwejexum.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/14717503249.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/tajujibuluzu.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739801aa087---34871484013.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/jogukitug.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/82329738322.pdfIn PDF document text
    • http://hkacca.com/userfiles/fotebawe.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/44022341547.pdfIn PDF document text
    • http://rts-3.ru/upload/files/bizemofataluwitigo.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7daf85e35---69781217474.pdfIn PDF document text
    • https://egf.tw/test2/images/file/47322162929.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/jemufezut.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/31697760395.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/fofosojusudaluwikisos.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/feberivevip.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/42356945433.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210625053607_ggt7yz.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/74207027894.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7a8aecf8c---31024011289.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/tinakhue4p1b24pvgp705t3dn1/19919813606.pdfIn PDF document text
    • 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_off0000b6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B5 11224 bytes
SHA-256: 18a03a8fc7fc55a174c55b8ccfcd9be461e8b1a7d373c60c886e08c8f5c3bc1e
font_01_sfnt_off0000d08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08E 19148 bytes
SHA-256: 9b7f682c8b44b5b03d3af29bac906d0ef08fd0d491d1e562ad8cf19a2ba7aa95
font_02_sfnt_off0001014c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1