Malicious PDF — malware analysis report

Static analysis result for SHA-256 914cd5f17472cda1…

MALICIOUS

PDF

80.5 KB Created: 2021-09-04 02:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0cb46befc084f20dcbf10ae43334cb5a SHA-1: 28912a6127488e7e96840fcca7f62b65dab0344a SHA-256: 914cd5f17472cda1a4efce07b75da2b0f9920bfcfcd24d42235d48eefebc417e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://infrive.ru/uplcv?utm_term=allen+bradley+micrologix+1000+manual PDF link annotation
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/saak4vt62qg3a2fihc13o80hu1/fezamovemijixazob.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/savuwilifulanobozujonep.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f63c8c28789---78840988756.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/21597020017.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/57955413658.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/60309447868.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ece47a63d5c---96515458241.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d1961d31---wiruxovarejumesosu.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/fodidimifukazuximozamixu.pdfIn PDF document text
    • http://seamacros.com/upload/file/26827713481.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/77906404138.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1992c608d---51937718516.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202106110804297268.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/nktuoae0dqipol7m7c2728a5bv/56576933084.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/083fddf6c5d3a827fbd113e920f54108/riselotojorugorimukuguwo.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c5d6ef298---58134052409.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/fe000e5c19515aa70001b4dea54e8c59/4291860440.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/95793805703.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/4167683812.pdfIn PDF document text
    • https://murten-hotels.ch/userfiles/files/mutituluxinuvudoxidinud.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/67907873785.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609d5461b5e97---setusev.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/kagawuvelenef.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/kefarapelebekala.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/uirpicg64g6kqliorl5vg91oae/3621458141.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_off0000d44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5D 17700 bytes
SHA-256: 46bd46b7df622b42258a37ebb5bd78ed958264582c51e8d295869ca2563442ea
font_02_sfnt_off000118eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EB 11060 bytes
SHA-256: aac2e9497af1a50a69b530d028f3a2d05316a959fdef77ae22fecbdc6aa17615