Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f4ddeb0caab164…

MALICIOUS

PDF

98.0 KB Created: 2021-07-18 05:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1f00b152d7c328b2332ffc595adc808d SHA-1: 17a43b3e3778a84f8e8249ee3141db8d0058e44a SHA-256: a6f4ddeb0caab164be6f1cf405f1520f42db4a1eeadf5c5f3695aff0194aaa02
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm designed to distribute content from various hosts. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/2fbbe20b9708e43164cddd15c96ce66c/tajixogojogavovele.pdf In PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a16d7615952---36626751565.pdfIn PDF document text
    • https://yellowstonewildlife.com/lijetedaforedobifemober.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/80305086156.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/bebcd49461c67ed994976fd2c7bfc797/dedugutenusegizodan.pdfIn PDF document text
    • http://abnicum.com/files/file/vusopevedoxumi.pdfIn PDF document text
    • http://rayer.cn/d/files/fupil.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b722cdbbf---95932357558.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f452d691e7---48162239483.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829e334b0f4---lesupo.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d089dc66716---dogudajup.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e3f88aeda---6441079635.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/29207140181.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609821d2e1f22---gomol.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/ka6srth3n9ihfl33laqv20q661/18882778552.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/fisozez.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/tonukamuwepokobetirider.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/torelepadibamituwisew.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/0eadddeea7ca5ec65b05813f3cdf6052/xubadipeg.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/11ee1ef0e9e702fb43380f390e084583/39204877710.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/likafebarow.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0e80944e7---77419261082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=lomotif+triller+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10392 17424 bytes
SHA-256: 91f9e78f39edf0e0e397c04a33c6cc5d988ccb11d17689022be4978e044a1169
font_01_sfnt_off00011c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0B 17720 bytes
SHA-256: d202744d7c533a0c1917177bdf4c9ff473e72874357e39a93a33042b1af69479
font_02_sfnt_off00014afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AFC 10304 bytes
SHA-256: 0bea3af267152774b3826d96f76e0267ee9666e3a628aadfb546d2702e472e48
font_03_sfnt_off00016219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16219 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1