Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a7bb69c72fbe202…

MALICIOUS

PDF

84.4 KB Created: 2021-09-01 23:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 543f25e994cf5e9528b8787c5984efce SHA-1: 5631baf1f553e84bcd3847b55ddce431553759c3 SHA-256: 1a7bb69c72fbe20270408ce3e879351d7564c3a60de7e90e933477ab894d0faa
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection or exploit vulnerabilities, aligning with T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://ilexgold.com/app/webroot/files/userfiles/files/moxumetukidevogoxasafinu.pdf In PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac264ea33e9---4572436683.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/l8nkilo9gfla6nlf59v0iesp09/rafodomixixi.pdfIn PDF document text
    • https://campermagazine.tv/public/file/5238267715.pdfIn PDF document text
    • http://babamoleskine.com/files/file/23512728053.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/71613446816.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/656002b126ae6c9ddd763820545ab8ca/tejobogega.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607546b7d61ac---63042272186.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/56453615280.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/93752933103.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/34083677476.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/sobenijebumif.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f21c4a24c8---kawuk.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dab9c57f2---satuzexuvogajurumoxoxa.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/1371270946.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/66693399503.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/2839973700.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/wasapa.pdfIn PDF document text
    • https://ubranni.com/uploader/files/nizavejelaja.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/kixogolilikebogela.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/54753975058.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/dd728e68f4adf79d7035a3155f30e9f0/99889924653.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/r8n1lu6annl1jsj3rjl9brg3kc/9632956955.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/e8ed39f94a2a8ad18ace518f3ae8bcd8/bigevepun.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/h9astcklo6g518au630qo56725/24520527568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=g56+transmission+weightPDF 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_off0000e3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EC 10936 bytes
SHA-256: aff42a88a6e9802423ad00af65eb5f98bf15846e75478951411ac1e7643a7719
font_01_sfnt_off0000fd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD42 17776 bytes
SHA-256: 0d03f763bdffc0baffb6662a764d165b44b8416ca6c4dc333e32dcdaed209160
font_02_sfnt_off00012bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1