Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1a808ea04a5f4b…

MALICIOUS

PDF

77.7 KB Created: 2021-09-01 01:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2a714eed79160a2fffd9be18106cb1b7 SHA-1: 769a025ccb5d9d86af3e1cde458eef7b38c8f76d SHA-256: 5a1a808ea04a5f4b930cbf66fc246b68eb62545538fe1c1c318ef627a414d6db
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised CMS uploads, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://smidgel.ru/uplcv?utm_term=what+is+the+noun+form+of+discover PDF link annotation
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dac31abbbb---wozoxow.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073299e3270a---3993405346.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16082fc970bcc5---71934411497.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4590ba12dd---486015056.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/foketekukelotumuv.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/runagifapafulelunenub.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210530081301.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/27788236530.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/07/file/202107210135325950.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/49cb0631b58d44ad104cd8d5bca91d13/govakufizatemekubekikini.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f643808a1c---setowugudiritimezowuzik.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/fawubite.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105f04cb0d5d---84569551310.pdfIn PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/sikawuraxukoxurevizep.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/10213206606.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/kolosupemitosososobuva.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210714_5D973537E87F7D85.pdfIn PDF document text
    • https://ahha.az/userfiles/file/xogelapuven.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/45555003638.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/vatefewisezagibedag.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/80032638703.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/42385887278.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/65320159219.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/kagukafexadoz.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210602/file/16226086488313.pdfIn PDF document text
    • https://vleek.com/uploads/files/misijologedaxobamusa.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_off0000c58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58D 19060 bytes
SHA-256: e0741f71dde79311d8f393aff8781df179daeebc524d92afd7a6351b668aa154
font_01_sfnt_off0000f764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7B 10856 bytes
SHA-256: 6550b9e97529d990e7da03594d9071f83c2914c6b923f8515f054109f07cb515

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