Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68a5609d6ee6634…

MALICIOUS

PDF

97.6 KB Created: 2021-09-01 17:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a395e1bfd0771e73f76918780109dd34 SHA-1: 6d6167ed88762a0fb30b68fa6c668c5e140e8f31 SHA-256: f68a5609d6ee663480f5271be2e17dcc7f543bbd373fade890f34c4df7db3020
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lead users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://euroroma-bg.org/files/file/97581679270.pdf In PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/89070a7e9f5851688fea1e7a9887ad60/79757042350.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/ci3onne28n9i9gganejshdns08/virikapodonivojevafa.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/85676102241.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f724f04175---xolomivavabapoxoz.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/biwixi.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/plq9966rv8blo1o9cot66bmri2/falinevikesufoziv.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/zamudagegiru.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/1808064227.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/6ec308213603e6b7918378f2a361c458/paxujekumuzum.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e221df3073---gupenoli.pdfIn PDF document text
    • https://adikkedua.com/contents//files/87270044350.pdfIn PDF document text
    • https://heyratacademy.ir/file/xibilejoregubakinekimip.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/sofejewodiwekinowisiz.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/32745302696.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/4ea08b78cd5c6d183b020b03c56777a0/tekidamajozofarera.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/40895722959.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb1b14a790---62106188078.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/f6b8411181db6f8df1e847dd82eaa303/71873663722.pdfIn PDF document text
    • https://hostmegasoft.com/calisma2/files/uploads/rijepuruxenoroluxofo.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9dcb7471bc---18935228112.pdfIn PDF document text
    • http://landpas.pl/upload/file/38652743949.pdfIn PDF document text
    • http://geose.ru/userfiles/file/mekozefometewasenos.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/22147320827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=a+labor+union+open+to+workers+from+any+tradePDF 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_off000118a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A9 17272 bytes
SHA-256: 825f7a15a92aad37e358e0be127a5dc94da4c03d86316735e4f42739d8fd8583
font_01_sfnt_off00014598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DAF 11172 bytes
SHA-256: 3125f232b52d3177d8149e3191d26334648e60f0946b8f043df24f59d132a153