Malicious PDF — malware analysis report

Static analysis result for SHA-256 43eacb4ea1237972…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 10:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 38abae0103faf2d268af95137b6225b3 SHA-1: e36fd8213776c99fddf73e2f75ffb87b42482331 SHA-256: 43eacb4ea123797268b8fa0454cc6e071a1c18c9a49f76876a4bb90d087a999f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of embedded JavaScript, while not fully analyzed due to obfuscation, points towards an attempt to execute malicious code within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://astmasme.com/userData/board/file/wokodawifanafegimimarafow.pdf In PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/19882685645.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/71897346525.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613928cd5aa5b---fesavi.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/valomaziputeba.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/36e233412aa8bb7549059bf1185b965c/fupazazafif.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/rewasajubananaluj.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/wosuza.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/43062587804.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/68732227030.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614069d172e28---79247735889.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/lirurefininiripivafoziku.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/40838867650.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///sajuvizopa.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/mawemolosij.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/84574722379.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/panunamolaweme.pdfIn PDF document text
    • http://sapthagireesyathra.srikarpagavinayagamills.com/userfiles/file/vewemetuxesa.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/relirufiwaxebidup.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/83525578873.pdfIn PDF document text
    • http://nenorm.com/files/files/xutadiruwati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=download+farming+simulator+14PDF 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_off0000affa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC811 10880 bytes
SHA-256: 2d8e547324cff06f42b1029c16497a209142bcf63873699aa9178d68db4eda4d
font_02_sfnt_off0000e116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE116 15880 bytes
SHA-256: 3282682474100376e0890fb2bfefbcfb2fe50cc58b9969f694648c546f6cfd4d