Malicious PDF — malware analysis report

Static analysis result for SHA-256 83de4f0d434e13d1…

MALICIOUS

PDF

166.3 KB Created: 2021-07-17 16:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9c460a9fe0a89921800f3b0703db21ad SHA-1: 37974d2e75c48269d4ba5fafeff925db1dbca2fb SHA-256: 83de4f0d434e13d10e6647ab515184296c878665f233262f9305802ed957b8b1
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users through multiple compromised WordPress sites and disposable domains. The presence of numerous links and the use of compromised infrastructure suggest an attempt to obscure the ultimate destination and evade detection, likely leading to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9727

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 http://17njl.com/userfiles/files/toluzumetirizunonigadasuf.pdf In PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1f994b4c5---60111396043.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f12bd076a---polatozatuwafepejis.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/vubefofajekoxip.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961bb1cdfec---98156031803.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/22678757333.pdfIn PDF document text
    • https://andrejc.si/files/file/55417830413.pdfIn PDF document text
    • http://www.fk-fudosan.net/app/webroot/img/userfiles/files/bakubek.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/d334e04f1b065284c1c4f95d4519b294/bagonowatepemufikedifubaw.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/fc01fa9add086bce290d84421c7a4994/xarulaguxovifipoviz.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/11413316327.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/noputone.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/73929979896.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/p5nrcfivtghf6mag9pb1dca9cp/kuvosos.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/47665655981.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e35cf35350---febesoxovu.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/9242f5b9cae7d8dbdecf875bab6e1c24/17970492515.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/jubarogumu.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f35a66c18148e7e5aa931d1563e5bb83/razabefojonaluvaxen.pdfIn PDF document text
    • https://ancoraeducacion.com/images/62812839081.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e953d2edd5---34636612638.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f172d380ca---patozatuxaxiwaf.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/nibolupudulazinilub.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e298c1312---54437097301.pdfIn PDF document text
    • https://suksesunited.com/contents//files/sugixidotexabutos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=matthew+easy+english+commentaryPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000208a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x208A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000220b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x220B3 10540 bytes
SHA-256: 300b6b3e65995385798c31f8ecc5498f9c1b20b9b19092fdf685f026b10b85c9
font_02_sfnt_off000241e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x241E4 10872 bytes
SHA-256: c692edf6881f33c730d310cb1b5791a8fa2e9c0a0fb344136027f643d1498c96
font_03_sfnt_off00025ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25AE2 18388 bytes
SHA-256: 4affd138304238240771d62d15df2e03b5a59a4fecf111c0e4eb84d934c4b73b

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