Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8de6f6bd627740…

MALICIOUS

PDF

102.2 KB Created: 2021-06-28 19:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 67c5fb4f75b3a1400292c8aa5376a2e4 SHA-1: 7f99156459482d7581c0c41a9032bc3cf0288e05 SHA-256: 4c8de6f6bd6277407acfdba1cba50a57c16513640077dbaa1d0c6fac68535075
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, directing users to multiple compromised websites hosted on disposable domains. These factors, combined with ClamAV detection and ML classification, strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=nature%27s+colors+quotes PDF link annotation
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/66f9e800dfa2f6fca520f9ddcedf7a20/tojali.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd140cff74---xolunumodonidewirupeji.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/70e82ae7cc4faf62cfd1a9c0c49a2c4f/95027376399.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/271efea690646e33fc6820934b3e2e1c/35148803997.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/55713069827.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/73095622866.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5c2173caafc8069cbd825ced5954f832/93424522050.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/4f557ac35920aaf130b7996af00cc839/numizo.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/c5d51876496ea64baa822ab0c26becdf/14083685896.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbd8b55249---52939135645.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/bh7uncj8gvs3fsdn6hv4sj14d5/gajojejelijusufenep.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/pemuwuzavazijo.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/sqdg7dg047vuejd2b2hiv5ll47/robasamumafub.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/26015218003.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/46111223118.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc6eba7a64---padudupopaguxemani.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/n54vlrkeutff5420qjjcipj8a5/mewipuxevodozef.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/42760096364.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/mipurajumadusos.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6dc88fef6---gepex.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/wofowejofapevef.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160afde5b4504e---79034313250.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/fupirugoxunegekopose.pdfIn PDF document text
    • http://fittbikese.hu/files/file/21214261498.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/firurubimoto.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160887d280d767---46284674861.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/jupifesenufewu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1A 10284 bytes
SHA-256: 6639aea601903a4660ec0bddeb51171f06c2ea9f409607db3692d2c8c32194d8
font_01_sfnt_off00014485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14485 17716 bytes
SHA-256: 6fccd4753e48b23d15052169a4a7e9eff88f70b193dc3c342eb26c532626089e
font_02_sfnt_off000171bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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