Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7fcffe134d4d7f…

MALICIOUS

PDF

83.0 KB Created: 2021-09-09 01:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f81279e2736efff5a3344c4cda27cc56 SHA-1: 956cfd0c8c9ef7a70a27ff5f7ca5eb2708301dc3 SHA-256: fe7fcffe134d4d7f46ddccd44826e08901f9f4fcf4e4a91e51098ba7393a27a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm with numerous external URLs, many hosted on potentially compromised or disposable domains, suggesting an attempt to distribute phishing content or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://longarmquiltacademy.net/fckeditor/userfiles/file/66938353121.pdf In PDF document text
    • http://duonglaohanoi.com/userfiles/file/64743391553.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/tazebodizu.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/16172641974.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/210a63f7609ebeabf07418a0c85aa9b0/86386588696.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/18354265610.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/49206038207.pdfIn PDF document text
    • https://people11people.com/uploads/File/dakuxudaw.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/jubokiwesaso.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/rozeb.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/zowalukuviwilebefuzis.pdfIn PDF document text
    • http://c-six.it/userfiles/files/13479211402.pdfIn PDF document text
    • http://kco.su/userfiles/file/dugovikenasimisel.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/tajakojegamopi.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/7976099676.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612efc0d15cb9---bivebas.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/11996443053.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/32155495394.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/68549001023.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161392c7371009---16850910147.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/98799804822.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/lazolewesur.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613485481b553---dajojik.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/femukatesezixopiru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=blocage+appel+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD35 10476 bytes
SHA-256: 1370282332219c0a10fb524d0c172543bc139d542d9e3b5770610af833920d05
font_01_sfnt_off0000f4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DC 19588 bytes
SHA-256: 10fc519edfbd95a71cbb4a8bac725f84f8f870e7ddf6eb2c6addac9724b3433a
font_02_sfnt_off00012500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.