Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a51d8390a5296b…

MALICIOUS

PDF

83.5 KB Created: 2021-09-06 11:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e5109accb11e49550548a4f10b1261ec SHA-1: 3d13e94d07413b1c267643401fa58e60cb205f7c SHA-256: 34a51d8390a5296b033f8a765d53151189ca30d7ec6b990d69c96f0e5af0a774
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through a link farm. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://honderhotel.com/UploadFiles/FCKeditor/20210812090928.pdf In PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/tusunonobozikite.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/povixobibekinomeji.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/panifemuluvobevufesewifov.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083b520f2ce8---putabetaselis.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/jetajadaji.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2106140306240845039936hm.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bb0f00124---49842580792.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c740144eec---rosejixilivukifenikud.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/f4041e55d99ff626cbea972a62e93ead/22687377780.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210616133002128.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfac482c637---watuxupi.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/8c0a2456fe5581e17af706a4b8aa949b/39415616916.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/2adbff0d6e25c08425e9fb710cbc773a/28673899906.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/be519902326a8765a92b4159525d4bb3/13290161810.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/47631886073.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/44240592715.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b301674c04---peniladuzopiposawimabenen.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/26657224875.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/48853508686.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/56401341970.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/zorejisiresufojupelow.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609594bece5cb---tobefuzikagun.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/73826636474.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/gebiwevedudaxezawal.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720c02af198---tumowifis.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f04723c698f---tuzukirifefaxegowikok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=range+rover+p38+diesel+manual+for+salePDF 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_off0000e0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FB 17104 bytes
SHA-256: 7f80d584c892fd2e8cbb700ea484080ab5e5628e15c3399a4edeea856fb63b12
font_01_sfnt_off00010d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D32 11336 bytes
SHA-256: 68b5e3a69db2a5def15a1160cdb246f2aff2e64b3101a861c8c8888476c4cba1
font_02_sfnt_off000127a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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