Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d40e7fddabfff17…

MALICIOUS

PDF

106.6 KB Created: 2021-07-01 10:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36216faa1b2421505d589c4ac84ee223 SHA-1: 2943f2e57ea78416aed9d64ebd16436e9ca025af SHA-256: 4d40e7fddabfff173755bd6956efa53ab838a980c8a00bf865a62fad45579939
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a common tactic of using compromised sites to host further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f19093d3b7---dumoluxupo.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f25f92f346---vurixas.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e33593141d---34539756233.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081e875d131c---38585532839.pdf
    • http://technoculture.cz/admin/upload/file/tumexabutajani.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/076776bcb51245e36ce5488e75221651/tororutubamekosugakos.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/07f3f7b03291061de37e8f439086405b/68271800800.pdf
    • http://nfc.soo.jp/file/pefofisegageg.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/bv6il98ipitv5alq916umav3h6/67467732760.pdf
    • http://dentish.ru/ckfinder/userfiles/files/30108409221.pdf
    • http://toptoptraining.ru/img/upload/file/ponufusowasosajuku.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a461e4c710---kezefexabuxes.pdf
    • https://planet-for-events.de/userfiles/file/68121424128.pdf
    • http://namjapizza.com/app/webroot/files/visivubim.pdf
    • http://mabifitness.it/userfiles/files/83633634501.pdf
    • http://afghansolar.com/userfiles/file/74991400389.pdf
    • http://tomaszskiba.com/userfiles/file/muxujomazaposa.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608424116cc6c---715009472.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=find+the+measure+of+each+exterior+angle+and+each+interior+angle+of+a+regular+hexagon
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119f8.bin
0f5ee5b397126b9773176078a2f38638ee53da2fba8c7c54c6ce0bb7b51448bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119F8 16300 bytes
font_01_sfnt_off00013027.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13027 16792 bytes
font_02_sfnt_off0001483e.bin
c041dcc979381168020e274efd62631181b3ca8e5ceee1098c5ef5b5b57114dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1483E 11104 bytes
font_03_sfnt_off000161b7.bin
d78bd9b2dc20cbc8a0c18fda3b2edff01a20da80f1425b2668c7f10a146edbb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x161B7 20916 bytes

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