Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d626f0055dec36a…

MALICIOUS

PDF

86.1 KB Created: 2021-08-04 10:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1cdf594649b03617b58f7fe64b1180bd SHA-1: 78eebde6b139e34f2c9c6cfe4d15fd7bcc4cd751 SHA-256: 5d626f0055dec36a79e52a0e723286b203cb18587f74a688c1c3722360a0a40e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to leverage search engine optimization for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://archism.ru/uplcv?utm_term=taper+roller+bearing+number+and+size+chart+pdf PDF link annotation
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bd619b2d2---judowolikipidurejej.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c63464acf7c---69488032571.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/lerefojenifivag.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/66705523a7ee37dd9542cf82b8874039/6799995317.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3c44f6af9a7998b5298ab6d332204052/jenukapawat.pdfIn PDF document text
    • http://ahchala.com/img/file/zetatudorukabipi.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073785b081fe---pifinub.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701c970ff57---kamogudumiba.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/0a2ee1c7b490ebea65bcd790f67136e5/81761812324.pdfIn PDF document text
    • https://maility.pl_adresuserfiles/file/62046310254.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/74d5a1efc1ade1a4b8a6323f4b57b611/10953930444.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/60288351388.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae72029d605---dimebavarakadaxenunadate.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/14u3m18pq7550hf2ta3s8pjlgj/16244118001.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/5ef483cda23df7c234ed7f95dc5cebae/kizupovevapogezawubiw.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/viken.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9dfde1cce---xekenasuremadawo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0747317f5b---jebafogebixolowonofuwut.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/99873880787.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/53594983207.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c8c473460---15681313198.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/d457f617c011e44f4671c69a7cd601c7/kekewadipuzonisosogesot.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/zugovesazejeruxawadujabu.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_off0000ec3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3D 16872 bytes
SHA-256: c7174a4646e8451d7a19c2ca5f43d4519ad6d94f8cc496a7c315c2923915b98e
font_01_sfnt_off000117e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E8 11332 bytes
SHA-256: 6c5699d5c8baa3239781659396b9476d105c094cd68f335c3a06da300f357e14
font_02_sfnt_off000131f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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