Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2473919ab33df0c…

MALICIOUS

PDF

84.6 KB Created: 2021-07-06 23:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f836e5f412d4d288cce46415d31a62c1 SHA-1: efb2f856fe7f14cac48752a7f95046a98eebd3b8 SHA-256: a2473919ab33df0c4ba2bc0eed9fe014fbdba6d5298c121ab47a44f87044c4e6
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites or disposable domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the presence of these links is sufficient evidence of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://albino-pitti.com/pub_img/file/nanijoxaramunok.pdf
    • https://bem-sa.com/img/file/2059013959.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/s3pmeal6p75iiiu8r783c40ers/vizasusedofuz.pdf
    • http://wawa757.com/uploads/files/tupogiro.pdf
    • http://say-international.eu/userfiles/file/xogidawawikosolapadewora.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/7occu0rsbl5dshgrssmlhnqe7q/74340661386.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/c305f51c8ef75a02cb1c04a5756d8f6e/54304274643.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/964bf65c21419d82fbfe0cb23f0ff3f6/75808779488.pdf
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/0ee49aba5caebfee5eb5bb1185b6b49d/67757646168.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6455bb9dd---90406278552.pdf
    • http://quiltingacademy.info/fckeditor/userfiles/file/89675772239.pdf
    • http://aven.su/userfiles/file/53978138782.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d215c42c1c8---zixinozutibijepogup.pdf
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/sedutakanoxekitezojejitag.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa367631d3---xirujas.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/df30c424722464e6282731439d1920c4/17329711536.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901eb3c1f22---29594638280.pdf
    • http://naplesredeals.com/userfiles/files/nuxas.pdf
    • https://healthmatters.me/userfiles/file/pekadizajizulola.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0114f8514d---29968077023.pdf
    • http://foodchemsino.com/d/files/tipaxivoxiso.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc8893ba589---giborivevezikevigom.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cause+and+effect+exercises+with+answers
    • 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_off0000e442.bin
8c4eee1c0f238eb295974fe45442196c2caa7e0d6cb55e19899269d82f106f47
pdf-font-stream PDF embedded font (sfnt) at offset 0xE442 18044 bytes
font_01_sfnt_off00011420.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11420 16792 bytes
font_02_sfnt_off00012c37.bin
424af17c1104c29840d3e50a8b806820411c4f310d139dfca33efbf6b3dfd579
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C37 10724 bytes