Malicious PDF — malware analysis report

Static analysis result for SHA-256 da25208e4563198f…

MALICIOUS

PDF

83.4 KB Created: 2021-06-26 04:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc9c2131250ecc741aba53b2601496ef SHA-1: 857656d204997ab65c1cb351de76c19621aedc09 SHA-256: da25208e4563198ff0e4989cdd88182a86748719e2ac6c81b286f1b46b5220e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV both flagged this PDF as malicious, with ClamAV identifying it as a phishing trojan. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://anvlaw.com/userfiles/file/neponusumimiliraw.pdf
    • https://proxus.nl/file/79792261047.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/dd938945d7b40a129cfc38978be7cbd0/zubuzudusiranovajusov.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/72n7em55i92mejjocm85i6euf4/jotufijukutefakojane.pdf
    • http://come2menorca.com/images/file/73317972092.pdf
    • http://aceonlinementors.com/userfiles/file/lotapovivafono.pdf
    • http://hanhthien.net/uploads/file/tudima.pdf
    • http://gayaarchi.com/userfiles/file/20210619004653.pdf
    • http://mygiftltd.com/userfiles/file/38850301194.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6c0e496b2---liwivimesakimuv.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0e86cdcbc---77499308566.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/362ddbbddd6e9ffe76fb955a75508468/xuwupiwaxonabizijoxasej.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/3773ebde22e63ada251ae8913a0e9c70/76863632762.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/3d8228220a861aa65f021e67887c5bed/60179035441.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/a60ba6cbf282e5e5db877b71f6eff74b/33003853346.pdf
    • https://doanhnghiepvietnam.org/img_duhoc/files/mizotadagivut.pdf
    • http://aceonlinementors.com/userfiles/file/49130219180.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/4bibbsatn32mihmjeeu2liqai5/97715741404.pdf
    • http://czdashan.cn/uploadfile/file/2021043004205873499.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/5eadb58b54c5e71d9ae9b24b8945a67b/xetokatovuwawevevina.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=excessive+eye+blinking+in+a+child
    • 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_off0000e359.bin
b406de3dc19830709c12a58b46bcb705490af4a307ee5ce27e87be8d456fabef
pdf-font-stream PDF embedded font (sfnt) at offset 0xE359 16444 bytes
font_01_sfnt_off00010df0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF0 16792 bytes
font_02_sfnt_off00012607.bin
3993abaac45560a14ae33da05a3bd48405d2966d1f5a72d89815eed444bedb94
pdf-font-stream PDF embedded font (sfnt) at offset 0x12607 10828 bytes