Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ebfeaf116fceec3…

MALICIOUS

PDF

74.4 KB Created: 2021-09-24 09:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8b319e04e800b2f24920862a4c699895 SHA-1: 0b676e592c6a823b8617d20b185f1630738d7ff8 SHA-256: 6ebfeaf116fceec341d62ef0d8206fb9be60cb75e36f2de15cda45d434f0093b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites. Several of these URLs are hosted on compromised WordPress sites, indicating a potential phishing or malware distribution scheme. The presence of multiple external URIs and link farm characteristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://philabc.ru/uplcv?utm_term=greys+anatomy+123movies PDF link annotation
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/97374318171.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/15693606490.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210921170050.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614d490da6b02---rajakironotuxabi.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/pazefegajevoz.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/b098e88938b8695ef63112860a999795/36345917895.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/26567494820.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/91120992593.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/3a056152c55e4591a8b3b25d0631d5d8/50210681535.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/34950197025.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/gufotezeru.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/90391193729.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc1e79dc51---gizonevirujaneven.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/gozatejiximuporexolag.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/8a7d00b8116c43efedbf9e155911fc08/dixopisig.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161425d545d90f---99645834959.pdfIn PDF document text
    • https://csn-alliance.com/data/files/24617334649.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/xonox.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/fegukum.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-11/20210911101320648553.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/jixatowegidi.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/37894401978.pdfIn PDF document text
    • http://jx4d.com/userfiles/file/72566339988.pdfIn PDF document text
    • 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_off0000bfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD801 16500 bytes
SHA-256: eecf9c678d1789573e3308df2a19d1ce41299d24d9b612115f6bb1b56f0a320d
font_02_sfnt_off000102d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D7 10784 bytes
SHA-256: 29b3baf4958d91d09b9e07eea0deb9b5154122381f70d9c6af1d6efd77d29a9c