Malicious PDF — malware analysis report

Static analysis result for SHA-256 40bc5116c4efd966…

MALICIOUS

PDF

90.8 KB Created: 2021-07-27 03:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ef698f0b36b587c4830129fb34dbb60 SHA-1: 9a1b17ae9d7dcd819d7af6239a9564db7fe48d7e SHA-256: 40bc5116c4efd966b99b179e354a2469b4915ec948b6f6d4d01c13e1d48c3a47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple distinct hosts, many of which are WordPress sites utilizing the Formcraft plugin for file uploads. This suggests an attempt to distribute malicious content or phish users by leveraging compromised legitimate websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • 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://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cb26ded0b---46890125714.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/fc2a885c1361b5d50e4dafa5ec493b98/luwelen.pdf
    • http://rialta.ie/userfiles/files/68344855804.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e98e05280---67734228001.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c1e030fa5.pdf
    • https://coil.hk/upload/files/57263361573.pdf
    • https://kmkmekanik.com/upload/ckfinder/files/jotopividuvesixepumivexu.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f317d1d5a9f---xolepegikifujinozava.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f045675e7ae---65849748411.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608101c30677f---38313035457.pdf
    • https://unosms.us/userfiles/file/70495484019.pdf
    • http://zonwering-belgie.be/ckfinder/userfiles/files/vitavoleduzidodot.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/c341a6d9b6075fe22a8fa2a43ff05943/31873434506.pdf
    • http://supragyn.cz/userfiles/file/sozosi.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc42f430e2---mafakuxegopupebafilu.pdf
    • https://pmfegypt.com/userfiles/files/50240764895.pdf
    • https://biothiennam.com/media/ftp/file/rozokovigotofixitazarun.pdf
    • http://sacoorhealth.pt/site/upload/file/fawudafukoxepuwono.pdf
    • http://aygroupmuh.com/image/files/bewolavigobo.pdf
    • http://wf515345.tw/CKEdit/upload/files/puzogesuxo.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607364375a221---59504517440.pdf
    • http://dobrasekacka.cz/userfiles/file/xujofelarik.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/431d05bf606000adccd9fc6e97875fc9/6078386519.pdf
    • http://zulaikhatextile.com/userfiles/files/28678994464.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=rupaul%27s+drag+race+season+11+episode+8+full+episode+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcb9.bin
032b68ac4c4699517c7ef1db3f0743e140bceb115343b3b7970edde56fd43cb8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB9 17300 bytes
font_01_sfnt_off000129e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129E1 16792 bytes
font_02_sfnt_off000141f8.bin
1a3f41c4c2ed6fdeac48a792c8ee4d36372dce016af59fb4c1803bac08c55efe
pdf-font-stream PDF embedded font (sfnt) at offset 0x141F8 11136 bytes