Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95e89c675b8bb92…

MALICIOUS

PDF

87.3 KB Created: 2021-08-15 08:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ad78c9502a16747083fcb447e45e66c SHA-1: 834db39ae3c1e9eb977449c4502401131c57c4c9 SHA-256: c95e89c675b8bb921396dde37c34e6723b866656bc2e9e17fe88cd445cc9196f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=how+to+rotate+a+pdf+and+save+it+without+acrobat PDF link annotation
    • http://video-cycling.de/files/file/36532316323.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb78283513---wukefiburero.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/2973e0683e55e4d0044151763d1d49f9/kisanoritikexabademute.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd81b933c3---wawopisa.pdfIn PDF document text
    • http://ciskmv.com/css/file/83545866851.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/9c330cd7272b90e7b6ccefd02ca9f851/90320232867.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/nuxirepopizez.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/k42m8dk13kebb7plsakg50apue/69281583856.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/34fe5fc01d2d7c46d3c2a620997b5ab3/memijozarekirakowaj.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/jurefuxomaxefojape.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/35085023742.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/dulus.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/40e964c710dcb4d44a336c02e421ee84/kederoxulofugoku.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/67535417604.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf5bda4a71---posuwumukeserunutapes.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/39502702962.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/fedogifopijorotelosuvu.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadd701966a---12623427050.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/64473716172.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/8gbt764ve695quutpe0a6qg1g3/36672938086.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/3be10c23692f0b955677b69e345eca8c/junuzokobexobugig.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b33b5bb7340---71789942854.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/36162894944.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dazuboriwe.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/8045598814.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF2 16976 bytes
SHA-256: 6866ea16727391e047d3262bb080f6e98821b7f813e06a40391045e6e6d43735
font_01_sfnt_off00011bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEA 11056 bytes
SHA-256: 273f112e054c9116ba4b540c3c11654eda6b14f108189c0d5948172a59ff9ce9
font_02_sfnt_off00013568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13568 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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