Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb867a47cdd37ab…

MALICIOUS

PDF

103.9 KB Created: 2021-06-26 21:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 02206a9c23af038f495fb2aee36fad49 SHA-1: 76a3faaefda714dfadfa16210085c613eafb6d0a SHA-256: 0cb867a47cdd37abb24f15d6ab6fae6f22cc981118ed3e653f0c8033cb33f861
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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://grup-insaat.com/userfiles/file/xeputeko.pdf In PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b13783e8fba---20333243670.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/v1jjnf3otv69iu3qjd7fnmjg2u/fudenuwixozeg.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/b2d67226043e7b423ba5b37a64acf79e/konujevodufugoxanalumujew.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/82sdih06n0jrlv085lgrrbsju8/85220412237.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/70559801766.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/p649fdrlnba3uibkdbieauit6n/xoliva.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/72450384995.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1b93252a6---5575426612.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3c8673e3225badcff43c0199c9e1e253/8838285081.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b4455fa84---fevapake.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/vobukexogu.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/ganasejigelotov.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/16619772579.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/moxijufugabepuxufuta.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/34b4ab6717cb053ec0ebdad04b29d096/pagozikitibed.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076f42466701---mabopugokabodasogilalum.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608683566f6a4---bofelafikopipe.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/rebanawizorigo.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2sjdv7v9tktccbrjlinndojfc2/50057118686.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-20/20210620190406808574.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3e0b48531---45395917744.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1763b4467d---dipexeka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=soothing+in+arabicPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000f92c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF92C 29296 bytes
SHA-256: 93e44e9f9908a160292f97e92c04fe1acf42599cee1d99cbe43d779a444ac9a1
font_01_sfnt_off00012e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E89 19848 bytes
SHA-256: 6cac7339382b1c6d92b438cf88dae42600db6beaf1d59ea08557e5142ec2af50
font_02_sfnt_off00016284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A9B 10376 bytes
SHA-256: 847a27c44270bdc910087a58550dad73d988bb17a7ef5834e3ac7399c69ef70b

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