Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a302117f0717958…

MALICIOUS

PDF

91.6 KB Created: 2021-07-15 10:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 534e6f8f4dcff39cdd27418070305869 SHA-1: dd3cbb198a94e8bd809b6f2ffd06cdcb86e1c61f SHA-256: 6a302117f0717958d8d7550612430b88a6469090e5f2044aadbfeb1c5751d5a2
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160702c7bb90de---zepebelobosugok.pdf In PDF document text
    • http://amadpich.com/userfiles/file/8992268097.pdfIn PDF document text
    • http://chapelguild.com/images/usr/tezopaxiridu.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085823402172---42138453390.pdfIn PDF document text
    • https://jobtiara.com/files/files/11185619775.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/8966d9cfdab187f313f06a48dc15d189/zesozevarepa.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6bf9b7e860---86676843935.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/poruzeperaselap.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/vncjo8l8c3ep3smkgsbn8l7c3c/litipelonorugurowavuzon.pdfIn PDF document text
    • http://focostrade.com/files/20210612084939.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160984b5d9f25a---zokareb.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/goxewijaxasezariluxapuxe.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6cd3bfacb---pomitemobo.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a12f29e759---gilos.pdfIn PDF document text
    • https://memoservicesrl.it/file/fanamimesirukivisofu.pdfIn PDF document text
    • https://arerp.kr/data/file///dolunugoj.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/wuxodikumajadadunipabo.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/xefijotogatuvemeli.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/lilipabivazo.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/fuxigexaxukisonezagopenos.pdfIn PDF document text
    • https://superpart.com/files/97636262133.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/xaxuvudogorenor.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/9i9fl96uf7dfuue7gpkubmcl2j/kulalokakuviponovun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=mars+rover+arrivalPDF 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_off000102ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC4 9956 bytes
SHA-256: 7e8c00eb98266e09725383f5f3c9346a5289af5d515028fa1c27ee5a4ec98733
font_02_sfnt_off000130ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EA 19428 bytes
SHA-256: f678d5c3c79840d12a9230eba9bbe8bc847c4b61c3942c0fc1bc0d19247d0567

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