Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd9f0c27b14291c…

MALICIOUS

PDF

88.5 KB Created: 2021-09-05 07:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2db53b7dda037dc13889c0b0356e6932 SHA-1: 0af961df0924efea7c626281e2af53e04815a542 SHA-256: cbd9f0c27b14291c5a153da0bfb3ec3731e1ee88296c1120fdce0d4a7718d962
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/8fdc1d4c3000b997e30a6017c4fafa46/zawotunisavafoboxitenam.pdf In PDF document text
    • http://thankschicken.com/uploads/files/65008394762.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/f66f5db556aa24f43eaffab63f28a2ff/mesijazepalufumasi.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/157c455aca3497eb765e76f3194858d9/47664219004.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/d4c0ab3792b903af86dc90ac848c54cf/67350501278.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/9427c06f3c10dca8cd5b8f5aedc6d0a6/46205921462.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e009a988b22---57494775628.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/narenexewojuxe.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/951758bd3d6359c889661422fb91f0bb/63878358903.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/kogurororuberobeketagoguw.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf374242f4---rumilakimitufenige.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/birevosugijeremizi.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/jozobelil.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/05/file/47918712644.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/lowirubitoketutulolaregox.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/24933000144.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/f4626bcd82685055e961e7f5ac6d251a/rabolo.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/46124347009.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aea35f2fa85---satewuzunises.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160952bf2790c9---79568960288.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f638fa25638---wadowusuligirikewevajir.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/gro36a3u8nakq83dic79rha852/lubij.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160800cdd78b58---32073725489.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/02364428d0d1312a98db7de26f28f634/gomujokawuxufivux.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210828045903.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/d6eac262808c980980e96488ca1b06a2/42837622224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=goosebumps+deep+trouble+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_off0000f546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF546 10580 bytes
SHA-256: e5bba94fd95bd19a3ca0d438f675cb946feec24d696bc854ec03182e6a4b4204
font_01_sfnt_off00010d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3F 17860 bytes
SHA-256: 891d0ce85b86a6b3eebec6bd5170ff63aac2d434fb3e363ed44378bd9bc3165b
font_02_sfnt_off00013bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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