Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea513e685e82c11c…

MALICIOUS

PDF

84.7 KB Created: 2021-06-29 21:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7e47319fd06a07a3962be49dfe7430ec SHA-1: b4eb98715b4a2741094e46492a8aadd4a394fbe4 SHA-256: ea513e685e82c11cff7a325b91fe1f1e731c55f313f59016e89ed8a3b6ebc0cf
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised WordPress sites, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier also flagged this PDF as malicious with high confidence. The primary purpose appears to be redirecting users to potentially malicious or SEO-manipulated content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/6442e6d2653b22d365d712285b8af47c/gesozom.pdf In PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/vnecm8j1g92bm9t8i1prhdh0ad/rafanekudi.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f143c65ab6---leliguw.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720a1a5db07---zebaximafiletetukamupixo.pdfIn PDF document text
    • http://erictex.com/ufiles/files/pojewizonapid.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f4c67eb7---98358593727.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/pisixidag.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/17ec4503ef071d28dbe96ef10d56bae8/22962423941.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dea926e47---74167470221.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/wipiwixevatedane.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/tugenir.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/27985357491.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/lodinoditulokujefuxaw.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/o047ts659v3mdiem0k4mo3t076/voritujewovo.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/70990415985.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4ba37010b---59280507977.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/74912656112.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/70903882234.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/40086137121.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/rogorukimuxosovidupavokag.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/u4n9r4t771vqd1h0o3cla910jv/50275487118.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/506de566bd22d1467f7fdbd5d2226857/gebav.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089241fc711f---bakuxubodibuzetavutexef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=tooth+infection+painPDF 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_off0000eb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2C 10224 bytes
SHA-256: 1f502cd1ad836c18ad5aaebd299dbf6460f1ca5661bbc776143baf592056d2d2
font_01_sfnt_off00010211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10211 16768 bytes
SHA-256: 490d471a10d6134dfcda862528b98a63a071d0c93b0dcd151837725b1af2a4d9
font_02_sfnt_off00012db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1