Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe450d942729346…

MALICIOUS

PDF

82.2 KB Created: 2021-09-02 10:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c743dccd8e92f4dc7cc714f2da91cd65 SHA-1: 33b3cdf0c9783e3f3135e02246b238a5fc1f9e6f SHA-256: 5fe450d942729346e1dd7d5b2b1d3b6529d40d67d3fb4c530da91501192eb262
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites that host further malicious PDF files, suggesting a phishing or malware distribution campaign. The presence of numerous links to potentially compromised CMS upload storage reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aced137ad8a---67466469383.pdf In PDF document text
    • https://vildmarksjagt.dk/userfiles/file/77366276143.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/bavofupimidiwejepureguz.pdfIn PDF document text
    • https://stopserv.ru/files/file/70977799418.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/d08c2770f12e19970af4632fff062692/99607052694.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160774d8d007fb---fokilenoledozibava.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/71067382312.pdfIn PDF document text
    • http://recrute.fr/files/files/pejorekunidowetoze.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e79a2266e---61794786917.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ad64b2a71---mizen.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/retigukagoropozepo.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/508c0c327bc3fe8942737c28e30175ef/tegumirigupita.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/58732831769.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609844e676292---dodikifesexetuvuvi.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ab50c87cb---96608144121.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210809/file/16284568671587.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/kivoripepexeviba.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/75348301905.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/26997502285.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072871751410---50398372769.pdfIn PDF document text
    • http://usateatop.com/_upload/files/74456330860.pdfIn PDF document text
    • http://paliukenas.lt/i/File/1051659700.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/67486087014.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=homonyms+of+bailPDF 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_off0000dda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA5 17896 bytes
SHA-256: 45f471ecf9204283e6d328aa13939861399834b375e4da02c8ab31d2e9374617
font_01_sfnt_off00010b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7B 10288 bytes
SHA-256: 3fa50fdbf36f38fa97d7c79d257de540d815b0d21b72413448dc1b997f0f5291
font_02_sfnt_off0001228f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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