Malicious PDF — malware analysis report

Static analysis result for SHA-256 011e76da2ecdc5af…

MALICIOUS

PDF

91.3 KB Created: 2021-07-08 03:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a406b6fc4aedd9dd126c7038f3b1acf7 SHA-1: 0697acd886ac5dee2320c85224b2bbf7f7d0658b SHA-256: 011e76da2ecdc5afefb3b410028e1039442a684521a6298a3f3b7ea218f08af0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating a phishing or trojan payload. The document contains a link farm pointing to numerous distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted from this sample, but the structure and URL patterns are indicative of a malicious PDF designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://kodcomputers.ro/2664/uploads/50141158301.pdf In PDF document text
    • https://vandolderskb.com/images/usr/90871933576.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/naxara.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/rotijotanuvegeru.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3d70d5581---63265419980.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/nadabikutowoxafinira.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/gorigigebigorukonid.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6f25bf3e4---44839930103.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/dc52c57cb0d54e7c492b362e3f15b23b/93868070019.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/32760027989.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/nesidabuwuturotaduxukuzon.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607200a20c563---66528711998.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082516cb9251---xusamaxuwulotupufapetola.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/maxatokukuvafofokatinivip.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c62f9e61f67---72038442903.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/a382bc5a699158bb8a4bdd10fe78cd15/lirijatukezitid.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/78165353625.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45aabcd6f9---76227363924.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c4a4d6c61---kikagesovuretezoj.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/99562870842.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/surinijiwokazenolawe.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607759cf3b18f---nibuduposujejodakunutafir.pdfIn PDF document text
    • http://imi.vc/upload/files/muxotodefuvufafekatozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=accidentally+dry+fired+bowPDF link annotation
    • 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_off00010178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001198f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198F 10620 bytes
SHA-256: 8b461298740f883ef9333e985ec0d452e67ebdba3f2363d2a9cf666ce34f2387
font_02_sfnt_off0001320b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320B 17160 bytes
SHA-256: 80b18d941d8ee194c67d950584d032ac006c4ef97088076787baeea110f0d387

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