Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b83e15c6bd8caf…

MALICIOUS

PDF

93.8 KB Created: 2021-09-04 10:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 470b75c7ac4520a5a269d02c0a48de42 SHA-1: 2086595b9ff9692ef81dd525333d1a250e7b08dc SHA-256: b4b83e15c6bd8caf3c0d9d228c3dca0b8d0d4251d0fadf38ab89c1adf095e886
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to PDF files hosted on compromised websites, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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 http://dalnoboy.org/data/filestorage/upload/files/kidobokipofowiwipinesogu.pdf In PDF document text
    • http://mtecommerce.it/public/news/file/kitoxawimugudaduwalug.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/2hr539uf99a16lpmo22o8rhfj2/robuve.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/05eed66d738d5528e7dd6361567ebb99/90934544533.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd7a60a71f---repixadi.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/faxuloz.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/fimarigujosipojuzisatozot.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/baxiremupusejimigo.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/lefozepagodaxog.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607081ab14e9c---2737345065.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/sa26krhmbl5ehdrr81gi6461h7/54862103967.pdfIn PDF document text
    • http://esejsc.com/upload/files/6238193217.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/38003779210.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/21735119513.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/61b4758aeb83d1fc1666270cd1951cab/nidirubuvuwoxefakulif.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/0aa76e3db3f223889008b739db4e1a6b/90527195614.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb279d6cf29---lixapune.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a2acb0f397c---xoviwufop.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/mozufijom.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/rn9kg70e6ujmhekpqt8guj5qul/61945946817.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/695f648b60051d1039e1b2fefee3baa7/supur.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/g8kjs1uasbm5jtnj5snmveuu3q/95201387403.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/a5fhonva2cc7m6e6hl3qg0n65p/basubibitunubopuraful.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/11b3a93b2544e3b8c31373a49818e583/69242249410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=chuy%E1%BB%83n+t%E1%BB%AB+file+pdf+sang+word+mi%E1%BB%85n+ph%C3%ADPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011198.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11198 16836 bytes
SHA-256: 79fc2f947d1bfa9347ec6d1720279a06e7cf4727da7d57c427cff5ac4b83fb6b
font_00_sfnt_off0000d14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14D 25676 bytes
SHA-256: f7c91654952a056e707a9ba3d3d15cd26d7592818a25fd73dff02cb740145243
font_02_sfnt_off000129f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F9 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off000131f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00014a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0C 12040 bytes
SHA-256: 14727eddf01b0683de57ffbb9ad20bc1d2ca734edf161676104b1cccb80d92d9

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