Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f4cd8e984f47fb…

MALICIOUS

PDF

86.7 KB Created: 2021-09-07 12:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c31d7c0e6bff0ef419afc6f02a5ed069 SHA-1: c848c5b1e2392022e2428c33f0b3468c92c58084 SHA-256: c4f4cd8e984f47fbc82d735284f56e013101b4a8b63eb19b9962759e53e0ac34
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The PDF also contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://7seapharmtech.com/Uploadfiles/files/41273906558.pdf In PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/23afb89a227071914c1dbe83bba9a513/jokifejokazi.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132b59517d4a---12000987294.pdfIn PDF document text
    • http://elm3rad.com/file/26175715557.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/20igh946kr126qf4jicenurjp5/92812261056.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/87258576734.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/28802291568.pdfIn PDF document text
    • https://smithsgame.com/calisma2/files/uploads/sidepuvagigexudi.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/revakepifuro.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/tujixuz.pdfIn PDF document text
    • http://secretinvitation.net/images/files/tuwanoxedekas.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/70724107003.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a704a1d4a78---gawokutisag.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/7necj3ktmclg2u75ovu1furtbv/jorulapeg.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/rerujodoxo.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115e8d6d0eaa---72120111972.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d503c344e---46818078613.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608125c66dfea---46838458669.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/ketibubupojo.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca94cebf3---17071498646.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/78744933117.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/wujefuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=mathura+tourist+map+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_off0000efb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 17884 bytes
SHA-256: 652b2ad4be2250dcc418de696e6617cacc792158d12d5ade302488b6049cfb36
font_01_sfnt_off00011d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001357c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357C 10572 bytes
SHA-256: 75d0af956ef68fbde090592a589512c014196265b6769034758758b524774e9a