Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1fad1fcd9f9d398…

MALICIOUS

PDF

89.0 KB Created: 2021-09-01 18:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 50bfbbc7ed9ff25b7f9025463323f3bb SHA-1: 79caf06b7fcd536074229204c70dc4fa8ba922a2 SHA-256: b1fad1fcd9f9d3982eec47921ee149240c1017b840235fa337a88d57cb81f946
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lure users to malicious content or downloads. The presence of multiple external URIs and link farms on disposable hosting further supports a malicious intent to distribute harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/1a2c0ittfqj7m8m06bhfg1fs0g/64174989734.pdf In PDF document text
    • http://langfordfinancialservices.com/userfiles/files/nupedazuxavakukowufel.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0c1587082---77532616412.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/25771604804.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16092e3351cdb0---zuromumi.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/supuseledomem.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a495175d54e---mogogujoneregozatokamok.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/kigiwizowex.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/80393248266.pdfIn PDF document text
    • https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/wurulifuzozozedagipoto.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/23508206739.pdfIn PDF document text
    • http://bonapartefamilynetwork.com/clients/7/7d/7d081654635712149502d88e72c54c2d/File/gurep.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2455a1fea---kerudixusadoboxufatigav.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/66833778631.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16078a63924abd---50332296855.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/3ebd89337bc9244d6642244e33dc31e7/gipotebafuvowak.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/npedhg75oql3aue1ijgopnh2ho/ritivavuxofojadudutowe.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/jakixexajom.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cd2abf695---modupa.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19205321587.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3f90d118c5c64d2a4202c9c8908a4c4d/24491144431.pdfIn PDF document text
    • http://safetypath.net/cms_images/nojefetorizil.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/zutatupilugovebire.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/27220952422.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703e2a6fc54---29394101506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=formalist+criticism+poem+examplePDF 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_off0000f8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BE 10508 bytes
SHA-256: 2a32b14c6118a932b3a1bc1d907d675af7f96a6a112d94d9fb3b5d244bec9d8f
font_01_sfnt_off000110b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B2 17452 bytes
SHA-256: c172bee2a54f50cacd8eecb966f645620a31887e45aac8690f551079cbde33cb
font_02_sfnt_off00013e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1