Malicious PDF — malware analysis report

Static analysis result for SHA-256 184cd3e2941f3e11…

MALICIOUS

PDF

81.5 KB Created: 2021-09-11 18:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9f1fbce9b3aa57ab5b41f6ef027e5d22 SHA-1: 269a55348610e07012ad99eb0fe824a033b8f492 SHA-256: 184cd3e2941f3e116de2b0416c6264ed71ad866ad7ab9f2a57b42356d5152b22
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with several pointing to compromised CMS uploads or disposable hosting. An embedded JavaScript stream was also detected, suggesting potential malicious scripting. The combination of these factors indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://crewmak.ru/uplcv?utm_term=name+of+planets+according+to+distance+from+sun PDF link annotation
    • https://globalcircle.club/userfiles/file/genozixijefupasup.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/35664924181.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/jewisusawidewad.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/vimovok.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/31007060824.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/wevujaduze.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd4de1fe92---didorasukiludadoj.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/16736812210.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/dizamesexanijobogu.pdfIn PDF document text
    • http://klhl.com/userfiles/file/54088422818.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/kozadezimuzakoxekulevo.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-07/images/files/81840519152.pdfIn PDF document text
    • http://iviltra.lt/images/files/pavitol.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161365c52292d4---liselusawuj.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/90683644275.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/56776674299.pdfIn PDF document text
    • https://akemi.ro/hirek/file/85344506842.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/49901951603.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/33543753629.pdfIn PDF document text
    • http://airfa.it/userfiles/file/10261276015.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/21354529993.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/muzuxinelif.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_off0000d604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD604 11040 bytes
SHA-256: a00132c048874263a24b3232075ded236fcd883b8b44bf0eef0fe920b849b486
font_01_sfnt_off0000ef7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001078d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078D 18680 bytes
SHA-256: 080721587907f0db4fce69486df0c232c15dab58957b07962f22f5c0593817fc