Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff444d2bc4d0ae2c…

MALICIOUS

PDF

83.3 KB Created: 2021-07-08 22:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3555a8e3227390a35a5d8529758bc25d SHA-1: 5c37ebc146ff97fe3f4893874c92d5b2099b4501 SHA-256: ff444d2bc4d0ae2c9974ade662c019b2b92715e886e732a167f723e8eb6289fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://medtravel.lv/images/hand_uploaded/files/diverizazejum.pdf
    • http://wirheiraten.de/images/file/26628713955.pdf
    • https://dusunceokulu.net/resimler/files/60239720311.pdf
    • https://triosms.com/userfiles/file/zefipox.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/30259e96a3022add48d4520d9758f152/58419749285.pdf
    • http://architettotoma.it/userfiles/files/davovekulezepuv.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da1c4be57b8---34299816000.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/f344439eeb212b8da5941320fdf9a21b/69509742873.pdf
    • http://loscogliodifavignana.it/userfiles/files/69322014378.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/6b9ca63b91bbcd9c39aaced255b57823/butexupomezudogimo.pdf
    • http://short-story.ru/upload/file/69388500714.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/93156602321.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/kpvlf8vc7bmq16jhe12k36tc25/4889689378.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/i7kd6itrcc9olp3po593cgkrl2/85977304134.pdf
    • https://fajndoktor.cz/images/file/files/46288252649.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/568891e347cb085df935ed1e4715c3a0/dobizi.pdf
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/texoxesixa.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/4b63bfd13aac1e2543ccc305cb2f8f8f/91805288130.pdf
    • http://aucoindeshalles.fr/menu/file/zizumu.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/d6c495475b39dd8ffb1cbdd8d3d3804a/befajazazubuj.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/237d9bb978183dd89207b12dec62a67a/82522063283.pdf
    • http://hnsunnyfood.com/d/files/bumiva.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=fast+twin+engine+prop+plane
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e41c.bin
48de8edd87ed390f7a8b876e433c2a66688c368311db794c1310de4983315af3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE41C 17028 bytes
font_01_sfnt_off00010ff1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF1 16792 bytes
font_02_sfnt_off00012808.bin
53c62cbfdb1f4abea3c4f37de983d36c24c7f371e407d3324c9e28147db73e8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12808 10488 bytes