Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b893a28fec49ad4…

MALICIOUS

PDF

84.7 KB Created: 2021-09-08 19:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 019ca17deae18e5cc8f9f36506a1e71c SHA-1: 0cfc882aa0b6a3517a9d41fda0062c2a7dafa488 SHA-256: 9b893a28fec49ad47f3b98fa371b95cd4295cf6ee152319e4dcd544e03294845
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, several of which are hosted on disposable or potentially compromised infrastructure, indicating an attempt to obscure the final destination or leverage vulnerable sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://wsmr.us/userfiles/file/19374333734.pdf In PDF document text
    • https://dafelia.com/files/dikim.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/pajipuvonelujezetonosak.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613801134fe24---penemekop.pdfIn PDF document text
    • http://sparkpro.lv/content/file/notarulugavololiwibatis.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/28537454405.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/mofepoxusat.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/36502227196.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/12922714093.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/53398195910.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613235ae99c89---lutesalefitigego.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/ximeresufosabarijeno.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/diwivusit.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/11848074163.pdfIn PDF document text
    • http://baoveantam.org/upload/files/84769841806.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/kuvugabi.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/65003760465.pdfIn PDF document text
    • http://servmed.net/userfiles/file/34347384936.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/zaxilog.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/lepovasarakaradi.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1630756676.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/eosc78m84339u3m93onou2lp77/24110925288.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/dudexi.pdfIn PDF document text
    • http://skolky.info/foto/images/file/53570794926.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/73481676855.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/menozewokepuselagufukez.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090610301573499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=entrepreneurship+development+pdf+jntuaPDF 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_off0000e553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE553 11044 bytes
SHA-256: 1c11504279996fa42f1da6243503fb6d1f88006b38d19c2c171b0b0174a26e8a
font_01_sfnt_off0000febe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBE 17792 bytes
SHA-256: 820fe4ed224fdc288d31d3ead39ad9ff79f865840d1df7cc424b623ac28c2887
font_02_sfnt_off00012cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1