Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ba4e89f3079edd…

MALICIOUS

PDF

80.4 KB Created: 2021-09-05 19:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 7fc03f72ff47e795ce334b77b2b527ad SHA-1: cd5273702f5f49ad7273b86779f4ae0c19e12fa8 SHA-256: e9ba4e89f3079edd10a72b41681339166951b718b25033dbe97cc7e34c721e57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://handsonmontessoripk.com/userfiles/files/nekajib.pdf In PDF document text
    • http://soflocops.net/clients/81266/File/gipodawomemerav.pdfIn PDF document text
    • https://tcremich.lu/files/files/82869715999.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/34772777702.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/83685625282.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/warusudilazijufadu.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/68b997ad9dd6555b59b182550e28ddfb/43601854502.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/biridak.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/40v7q2hpa7btphitqf8qurusn0/15772259125.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/nqvdc9qpqvbanp96b7mesiv6r5/96267816287.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/zekixip.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162675263617.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607b25242453c---sizunivilasufipugeruvifub.pdfIn PDF document text
    • https://numberonerevolution.it/file/73169872669.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/50960148619.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/tuvidavipoja.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072a75c5ca96---xarafozinaxewumewalep.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/f103c75b70350c44a1e9782f93bbf780/liwafujonesofije.pdfIn PDF document text
    • http://odumakus.com/uploads/files/16745880191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=adobe+photoshop+cs6+image+editing+tutorials+pdfPDF 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_off0000d36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36F 11456 bytes
SHA-256: f1fc592d789d20226ae2e65e1f483ac5f6413e180d286f1a8ea88386d007ca1c
font_01_sfnt_off0000ede7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 17868 bytes
SHA-256: c107c6a15575796c0c9068d28858ff4e3b01ea07d2efab85463ed8cebf36e1dd
font_02_sfnt_off00011c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1