Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1f1194b2db7d35…

MALICIOUS

PDF

87.4 KB Created: 2021-08-22 02:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3e0c90c251e8f0c3d1521a8a40e9f8a7 SHA-1: 5d8c27824455cbd2e3cfbb85fb502f1e4a642e34 SHA-256: 4b1f1194b2db7d35f9fafd93a70b6003afc2febaffe2fcd1598ea379586a4c2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a strong intent to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=baldi%27s+basics+unblocked+games+world PDF link annotation
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080213096115---wijurope.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608326f19ef92---wiwawonuziza.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/66389198718.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/58649435196.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/xozuzakibupo.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/tazaxiniligogigijep.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f4ca5b73f---66144981427.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609381d1ad9d3---lodoribixepawotu.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/f043stjlbh788mcuoabud8vuo6/fezoreviteduvidewuf.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/tifez.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/92182952080.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/21930350029.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/4822989876.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/60u176amveb6kcvspchbkvingp/wupuwilinomezozewugakadew.pdfIn PDF document text
    • http://ombs.ru/uploads/files/bitawazewuz.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49412061307.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16104e4376ab96---nuvot.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/lezomijulapu.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2d93b1a2e02fc73697bb43a0e50791a4/33567171718.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/97316361997.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/jadixopoxasaxixaba.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd3d231001---jumaluzuxixad.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/ketokuni.pdfIn PDF document text
    • 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_off0000f118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001092a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092A 16464 bytes
SHA-256: 93b9f4baa174cf1f1ec0b8c52a57821222e8d775f0ae1bd1f8681382df350232
font_02_sfnt_off000133c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C4 11120 bytes
SHA-256: 5041bc62931213bfd4c24b32b3ccb0071bea08915e6057ea7ca2fd90eea75487

Open this report in the interactive analyzer, or submit your own file for analysis.