Malicious PDF — malware analysis report

Static analysis result for SHA-256 615e6f276c6c8f50…

MALICIOUS

PDF

95.2 KB Created: 2021-09-07 15:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b3ec7f0fa8a79d67a5b08cc03ce45b69 SHA-1: f7b2d24e8e7d8f290bf6aa30ef21d884cc050e6c SHA-256: 615e6f276c6c8f50f54925b59fa7cb5dbf6f64cbe30f5a8d61c7ec976f05da32
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links are likely used to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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://laborke.ru/uplcv?utm_term=classification+of+silicate+minerals+pdf PDF link annotation
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f027eee082---sevub.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/50594293255.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/97242606317.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/weniseku.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be97038423c---28659655373.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/30604886460.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/id6q61if2704tirans34b9p7c0/82690568497.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/8328614634.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8aca0fb0f---22967439618.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607540a484e57---zunopawaxawitupevejupu.pdfIn PDF document text
    • http://fxmeat.com/upload/file/e05b488a78e2868b97f322c2f6882733.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ae232d465---moxomegot.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/2566688831.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/gonusevekakidixir.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/27402066940.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/vezatelobumi.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/zexib.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/kifimalojatujudul.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/7b3445c3d603261dfe79c23bbe6862c2/88482658947.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160786258212fc---kopurelolo.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ba48f2ec217629589256c098928e44e0/zomekeduzexemajav.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/3785002ed98d39dd960a85e85f69f210/wepoduwixojopimop.pdfIn PDF document text
    • http://ailizia.com/userfiles/83268475117.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/nawefuv.pdfIn PDF document text
    • https://umartravel.com/files/87625075315.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/xisodofedu.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a98bab058---918117408.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/17783805113.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 10812 bytes
SHA-256: b5cbdd1211703e9ee74f875971b1e12d9b9902af871edcb293c66e37596f1833
font_01_sfnt_off000108a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A2 21508 bytes
SHA-256: e2a6dac3fa64158a936e9b3787d1e4f0f81955632642d681d79f8c6ded24a8f4
font_02_sfnt_off00014081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15892 16164 bytes
SHA-256: a29b536ab701e0f3a4d03943dd56dd4ec8b8c0d8b29b8e28b2448b9bd76a7e77

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