Malicious PDF — malware analysis report

Static analysis result for SHA-256 6329582c5a194ee8…

MALICIOUS

PDF

82.7 KB Created: 2021-08-15 01:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 55b3929b5afe443ea251d17e1a58eb61 SHA-1: 5f66905ff412d1f6f664263d7a8bb8b3205cbcf3 SHA-256: 6329582c5a194ee8a76219d89726832add33c7689ca5f0297834326b7ec93762
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The presence of JavaScript suggests potential for further malicious actions, such as redirection or exploitation, although the exact script functionality is not detailed. The link farm structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/12318f77dfc103a7cb7dd30ec070e24f/92547326087.pdf In PDF document text
    • http://ksnjl.com/userfiles/files/68415981328.pdfIn PDF document text
    • http://rilta.net/userfiles/files/logepibuk.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/c5gvqhbcl8oijfcij5p7ampi92/lavajepiwimajuzejifavep.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/qsthvdjufbh7d1fqk177nlhu9h/ruvadosekasejosava.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/1e2b0f89433a107a43372b7aca5708f3/26270765956.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e75f8cb6d---68469671173.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/68559574229.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/kixiwuxe.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16098e8b823943---pomujusetedug.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/d0nod69m2a752ouu6t3ftthbj6/gojozukirowazejorobuli.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac82edf0487---57091143750.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f88bc5d27e---7525054131.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/tobobumevelosizi.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/e130167d9d4bc78380dd63ca0b6acea4/36581303739.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b20bd77ef6---tazavetog.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/gubunubebajakelenej.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/1481554282.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/1n9c112juq5ijspept31083bv2/53721929143.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607313d8a87a3---8266493731.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/solojidorudiraropujuseto.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/bc5814645dc93b65e8d8a8f36a952aeb/jiduxarizarutabuxuw.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/ngp91mmsqh64s6bemn11dp4m5d/niwenidivepovijoron.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/61627810691.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/93397632998.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d1ad2da90a6272963e17c670329d60f5/61051851237.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=networking+basics+questions+and+answers+mcqPDF 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_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EA 16960 bytes
SHA-256: 3aed7c40c70105ee410d4390e5f9e8e83850a0eb4b57885f66301e38bb69dc96
font_02_sfnt_off00012323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12323 11208 bytes
SHA-256: 84ac6f97f5d1977acfff8ace12959bd1dbc17acfc1cc9606ba1d9b0774f49b89

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