Malicious PDF — malware analysis report

Static analysis result for SHA-256 f737d887fdb6bae4…

MALICIOUS

PDF

73.0 KB Created: 2021-09-18 11:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 18e6805e28035580b4095b81d43fb360 SHA-1: 19f22caec1372a0c19e4e8e95a473b33b1e22d50 SHA-256: f737d887fdb6bae4dc32810f8ae158c0c99bf6f5348aa686be8858459a547f35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or malware distribution lure, indicated by a link farm pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of numerous URLs, many hosted on potentially compromised sites, points towards an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613137b257f69---gesebi.pdf In PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/83799613272.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/nojevilum.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/miviturikaxune.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/9tt12npgj5haid9m9cd4qira3q/vagakodukazi.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/ef47c75129b299bc0b8873ad8cf4e997/lidotewufep.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/93337752260.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/vitabezatamoweremiki.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/15355552848.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/toligivoragibomof.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/254c24a4f565e8b5803d7f63b90056dc/69005706630.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/butuvegebizafafumowax.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16132e417498e9---50287468443.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/jafemoxavekanutuvomomo.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/zixis.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/rawejozajopajejofa.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/5593087936.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210904172243.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/92253269073.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/tofebipogagolofu.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/xakanad.pdfIn PDF document text
    • http://primaneighbors.com/userimages/tufenufolewogoduwalu.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/39077805668.pdfIn PDF document text
    • http://espokebar.com/uploads/files/7173264847.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/57292789439.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/23956770521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=lost+in+you+serena+grey+read+onlinePDF 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_off0000bb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD320 16612 bytes
SHA-256: 4d0bee6d24506dfb6e339a825a49bd62d2b320f2ed8716ae77e448f5f70aeb3d
font_02_sfnt_off0000fe09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE09 10596 bytes
SHA-256: 77f83e46b8a8b5cc0c6afdef659d42f5d27cb8806b9edc82041b866626486728

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