Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b93b0be6358cb59…

MALICIOUS

PDF

103.1 KB Created: 2021-07-07 12:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a8abdd96e8a32fd3970bada4d5b8c262 SHA-1: c9c6b6d817cbd055e6069c7132bc94a20e831b18 SHA-256: 5b93b0be6358cb59f9935d1a9b06b6d542e4ab8de6a3367dbdf49687706bf88a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://cructi.ru/uplcv?utm_term=sharks+with+laser PDF link annotation
    • http://dajuicebarus.com/uploads/files/jofoxuvapitexukamitoxuga.pdfIn PDF document text
    • http://royalproductsonline.com/userfiles/file/kamefovipuja.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/4e9b6bc3c4ba4a43d96f159e6414134c/19042197058.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/mapoxipadumimosagivilez.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/33680115665.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/4432f3df239581dad11365f0c1e6e18c/semoruxatonitilupediv.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/67380048307.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860a95946a4---7202543901.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/risarukabalijirexoxekif.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a86b42dc74---6573547604.pdfIn PDF document text
    • https://stopserv.ru/files/file/68852512609.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/motuk.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/933luv6iitnhg89f94aa12k2c6/32759849103.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13edfac421---53431298553.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/1830720cc6b741ceee299d07c3dbfcd7/potogazejeniw.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/0c5434bcad4bf315f5407e6e912bc077/fapekebonan.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083405b00586---rukalarewefusatuv.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5cb7d4171---10992612007.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072dbc92bb30---60884262050.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/felarepokubiwitogefudabe.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742d2a3c029---20735623823.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d966eebd2---14078639301.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/dejuwade.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808092c0567---makagixi.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ee00ee140---bakirekaxotutevix.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a74a576d591---35457611988.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_off0001308d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308D 10232 bytes
SHA-256: e2ba4a5edb29eefec62137a7d01d93b3f8d1df5735064f05a41c362f00d7599c
font_01_sfnt_off000147ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147BA 17836 bytes
SHA-256: bde72f115eb0890c16be02c23060e885f999bfde8a83f480a3c304f3f131b0c8
font_02_sfnt_off000176d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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