Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8f9c3265db0a3a…

MALICIOUS

PDF

79.4 KB Created: 2021-09-05 22:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6c1a17f28d4cb9e67f95e60bfdc4612e SHA-1: 7603b3badfa31db0f08390a8fa38db2dcce65ebf SHA-256: ff8f9c3265db0a3a3a5bc092f36d3e85329be0caeed3998f22ed9b2306b9b824
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this file as malicious. These links likely serve as a distribution mechanism for phishing or malware, potentially exploiting vulnerabilities in the user's PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f55710f2ccc---xutotujadof.pdf In PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a699ae4a99b---safirifutowexa.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/52b9356e2a7ee337d730cb1c3cf8ab42/pipokunorewibe.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb9f51c9e4---64730958494.pdfIn PDF document text
    • http://charivne.info/images/file/68390608232.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/wijapupetimogalonusifuvu.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd2529beaf---96848919662.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/xosedufokulidewilij.pdfIn PDF document text
    • http://terralindahigh1981.com/clients/866868/File/xoxuvadefijupiforul.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/rurigivinonasokurebop.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6c3185ee3---17147796748.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/accd1156b4a486005b1e1d60a6adc1c4/migozunur.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/46375192076.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/gujogivitukujukolo.pdfIn PDF document text
    • http://babamoleskine.com/files/file/pijorupex.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/sesizanebidenewi.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/36f47d124e988e23bfaa73ed7015809e/diladefunerebed.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161089aa6b441a---basudodijuzavudut.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/xosapegozoluradaduzatidev.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/84725334659.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/11427426220.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/5gojb26msel7qhk96pafpvigvh/56098821818.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/91156607652.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/6127362321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=sad+romance+piano+sheet+music+pdfPDF 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_off0000d361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD361 11016 bytes
SHA-256: 4e8b76edcb28bc1250a118f1bbae38c484868a132d210319737feaf8fc698957
font_01_sfnt_off0000ecbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CF 16784 bytes
SHA-256: 18968688bf2f82fc600700ed57e532f2606b7de234d0e0bba4e3b605a10c4c86

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