Malicious PDF — malware analysis report

Static analysis result for SHA-256 154ad36cb25d8ffb…

MALICIOUS

PDF

75.5 KB Created: 2021-09-15 07:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d0e2fdd1c68a502c16e1a6b19fbde629 SHA-1: 1af50e31bdbdbd454f6009b47bb72f762b69fb8a SHA-256: 154ad36cb25d8ffbc14ac5df8e0c4724d9565740194b4bc57ada2575fcab20d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as a link farm, with a high ML score and ClamAV detection indicating malicious intent. The document body is heavily obfuscated, but the presence of numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, strongly suggests a phishing or malware distribution scheme. The primary attack pattern involves directing users to malicious sites via these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://insights3.com/wp-content/plugins/super-forms/uploads/php/files/bf6ca0bdccd36e15de5ae46d72245d68/69335650960.pdf In PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/87228369923.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/gitejejikulilomivelax.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/60489760374.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/fdb8bd3o5vodhj6njs55brp7q6/xigekivafekunorete.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/80427675339.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141445dd744c---tefokevekowoga.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/mefemakiw.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/gunino.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a8aac52f6---29374082769.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/59192561628.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/gosowipelikogebo.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/95805788197.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/nijurerozirexe.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/3c31414e69d3b8d7256d51f33a5c9f82/64317133228.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/losogazetimigezaxeluxibom.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/90817102415.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/tarokebomalolivaxuso.pdfIn PDF document text
    • http://rc-modeller.se/images/file///3302893114.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcd3621ff2---gikadebizafexoxuri.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/vudeluninosoripufijudixi.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/56747985298.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/94359219878.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/xilexafogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=best+free+local+tv+app+for+firestickPDF 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_off0000c59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB1 10580 bytes
SHA-256: 005e8dc6be63d6bd6ae9e34d4194972b1f9dcbabb285872def5eb894b7e8dd43
font_02_sfnt_off0000f610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF610 16308 bytes
SHA-256: 97425e5f7827b541c67ad0002589e0656c11142c33e5e2f64a56a6f2bf18e9f2

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