Malicious PDF — malware analysis report

Static analysis result for SHA-256 22889b3a8a3273dc…

MALICIOUS

PDF

81.4 KB Created: 2021-07-04 01:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e327059d7025e74a67dfb17d4a687e7c SHA-1: 42460b55b681bf87183ab651b70075497c9ba889 SHA-256: 22889b3a8a3273dcd1b92fc81b2355f9579e61c7640a0b5d162bb79aff13c0ff
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs hosted on various domains, many of which appear to be compromised WordPress sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to direct users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://relatives-united.com/clients/75139/File/kopepinalerisekuzozerupu.pdf In PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae37a758c25---ponisomeweboruxim.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/55514470493.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/96a081e261553e76f3767e6218be0835/55624048969.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/sabogedudinugeli.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/10477275860.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e0b5648c---91334819831.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/v9cu5spphrsv0ntb8klrc7fg35/tonadolud.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/30819224942.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/34278082725.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/rumajunazusawalapuse.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/5856275541.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/64d44d4322d9f45b1673cf4aea5f3b46/zumevefem.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/d784cbd430c53c3e9ef09686320057e5/jowofo.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/30064069791.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/5kmsnbq5vbfpcp5vsg0hta2oci/jobajarumipafek.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079eae279e43---76590278390.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/2977687607.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/sfqvevnbqh3q5re8vtdriqu7tr/68835623007.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49d6d4efeb---10426641893.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/maduwegejinowupisovanigi.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728dbc14958---57831287337.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/i5ddg494hgsop9fo4unohgv49m/95848283913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=proofread+word+documentPDF 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_off0000dd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8C 16500 bytes
SHA-256: 30aad0773bdf3de464e3c2e03f16a31b1dcd59a22057c3317bc26e811951bf12
font_01_sfnt_off00010874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001208b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208B 10516 bytes
SHA-256: 9293974090f38ec9dabd05d48b8b8c00c5a563551e4d00f77bca52bfcaa78f39

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