Malicious PDF — malware analysis report

Static analysis result for SHA-256 68c6541a0de0236c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 23:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f004d864fff6e72a7aa0ad129cf11d94 SHA-1: dbd91571dc5a3362405bb6f76d5e8b4e7f3b9e94 SHA-256: 68c6541a0de0236c19cfba5714fb03cf384c8273168b4e6d7f9f318045c120d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a link farm pointing to various URLs, some of which are hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://tsutae-f.com/js/upload/files/miliwosiraxudejixepivona.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a44da2458---95202531471.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/mokajowaxu.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/37746756388.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/titazaripom.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/ovttm71240uhmv2d51bist47ul/fegenolutalimu.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/35524069716.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/2d58b1dc30853c1602302b5214741cbb/xaxumarifoziwazaje.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd4e3b40a6---zifimajorimezewo.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/tovazamag.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80400022696.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/55906089166.pdfIn PDF document text
    • http://biosite.ru/images/news/file/83227194954.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/52625963011.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/riniraxevo.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/29034859194.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210629091338_8at7h7.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/xubosubujem.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/tanasufegagedip.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/gedaxo.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093378f3a59f---12249432601.pdfIn PDF document text
    • https://piphoto.tw/uploads//files/202108090959417586.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/no0t9tltf0o4lhp9goe9kv94nd/jirasozuzuliv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=brocolis+beneficios+pdfPDF 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_off0000e1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B8 17652 bytes
SHA-256: 5c40ae8d613524355fc50d1309e330b9642b9da891313f8fb0031af0fe6c0a85
font_01_sfnt_off00010edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDC 10544 bytes
SHA-256: a204f3c9e7905f9e5813a2b609de72e1ad76a5817cc6bfd2c4e3e97e03898647
font_02_sfnt_off000126b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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